How to handle errors with boto3

Question

I am trying to figure how to do proper error handling with boto3   I am trying to create an IAM user   def create user username  iam conn       try          user   iam conn create user UserName username          return user     except Exception as e          return e   When the call to create user succeeds  I get a neat object that contains the http status code of the API call and the data of the newly created user   Example     ResponseMetadata            HTTPStatusCode   200           RequestId    omitted            u User    u Arn    arn aws iam  omitted user omitted              u CreateDate   datetime datetime 2015  10  11  17  13  5  882000  tzinfo tzutc                u Path                   u UserId    omitted              u UserName    omitted                  This works great  But when this fails  like if the user already exists   I just get an object of type botocore exceptions ClientError with only text to tell me what went wrong   Example  ClientError  An error occurred  EntityAlreadyExists  when calling the CreateUser operation  User with name omitted already exists      This  AFAIK  makes error handling very hard because I can t just switch on the resulting http status code  409 for user already exists according to the AWS API docs for IAM   This makes me think that I must be doing something the wrong way  The optimal way would be for boto3 to never throw exceptions  but juts always return an object that reflects how the API call went   Can anyone enlighten me on this issue or point me in the right direction

User · Answer

In case you have to deal with the arguably unfriendly logs client (CloudWatch Logs put-log-events), this is what I had to do to properly catch Boto3 client exceptions:

try:
    ### Boto3 client code here...

except boto_exceptions.ClientError as error:
    Log.warning("Catched client error code %s",
                error.response['Error']['Code'])

    if error.response['Error']['Code'] in ["DataAlreadyAcceptedException",
                                           "InvalidSequenceTokenException"]:
        Log.debug(
            "Fetching sequence_token from boto error response['Error']['Message'] %s",
            error.response["Error"]["Message"])
        # NOTE: apparently there's no sequenceToken attribute in the response so we have
        # to parse response["Error"]["Message"] string
        sequence_token = error.response["Error"]["Message"].split(":")[-1].strip(" ")
        Log.debug("Setting sequence_token to %s", sequence_token)

This works both at first attempt (with empty LogStream) and subsequent ones.

User · Answer

I found it very useful  since the Exceptions are not documented  to list all exceptions to the screen for this package  Here is the code I used to do it   import botocore exceptions def listexns mod        module     import   mod      exns          for name in botocore exceptions   dict            if  isinstance botocore exceptions   dict   name   Exception  or             name endswith  Error                 exns append name      for name in exns          print   s  s is an exception type     str mod   name       return  if   name         main         import sys     if len sys argv   lt   1          print  Give me a module name on the  PYTHONPATH        print  Looking for exception types in module   s    sys argv 1       listexns sys argv 1     Which results in   Looking for exception types in module  boto3 boto3 BotoCoreError is an exception type boto3 DataNotFoundError is an exception type boto3 UnknownServiceError is an exception type boto3 ApiVersionNotFoundError is an exception type boto3 HTTPClientError is an exception type boto3 ConnectionError is an exception type boto3 EndpointConnectionError is an exception type boto3 SSLError is an exception type boto3 ConnectionClosedError is an exception type boto3 ReadTimeoutError is an exception type boto3 ConnectTimeoutError is an exception type boto3 ProxyConnectionError is an exception type boto3 NoCredentialsError is an exception type boto3 PartialCredentialsError is an exception type boto3 CredentialRetrievalError is an exception type boto3 UnknownSignatureVersionError is an exception type boto3 ServiceNotInRegionError is an exception type boto3 BaseEndpointResolverError is an exception type boto3 NoRegionError is an exception type boto3 UnknownEndpointError is an exception type boto3 ConfigParseError is an exception type boto3 MissingParametersError is an exception type boto3 ValidationError is an exception type boto3 ParamValidationError is an exception type boto3 UnknownKeyError is an exception type boto3 RangeError is an exception type boto3 UnknownParameterError is an exception type boto3 AliasConflictParameterError is an exception type boto3 PaginationError is an exception type boto3 OperationNotPageableError is an exception type boto3 ChecksumError is an exception type boto3 UnseekableStreamError is an exception type boto3 WaiterError is an exception type boto3 IncompleteReadError is an exception type boto3 InvalidExpressionError is an exception type boto3 UnknownCredentialError is an exception type boto3 WaiterConfigError is an exception type boto3 UnknownClientMethodError is an exception type boto3 UnsupportedSignatureVersionError is an exception type boto3 ClientError is an exception type boto3 EventStreamError is an exception type boto3 InvalidDNSNameError is an exception type boto3 InvalidS3AddressingStyleError is an exception type boto3 InvalidRetryConfigurationError is an exception type boto3 InvalidMaxRetryAttemptsError is an exception type boto3 StubResponseError is an exception type boto3 StubAssertionError is an exception type boto3 UnStubbedResponseError is an exception type boto3 InvalidConfigError is an exception type boto3 InfiniteLoopConfigError is an exception type boto3 RefreshWithMFAUnsupportedError is an exception type boto3 MD5UnavailableError is an exception type boto3 MetadataRetrievalError is an exception type boto3 UndefinedModelAttributeError is an exception type boto3 MissingServiceIdError is an exception type

User · Answer

Use the response contained within the exception  Here is an example  import boto3 from botocore exceptions import ClientError  try      iam   boto3 client  iam       user   iam create user UserName  fred       print  quot Created user   s quot    user  except ClientError as e      if e response  Error    Code       EntityAlreadyExists           print  quot User already exists quot       else          print  quot Unexpected error   s quot    e   The response dict in the exception will contain the following     Error    Code   e g   EntityAlreadyExists  or  ValidationError    ResponseMetadata    HTTPStatusCode   e g  400   ResponseMetadata    RequestId   e g   d2b06652-88d7-11e5-99d0-812348583a35    Error    Message   e g   quot An error occurred  EntityAlreadyExists      quot    Error    Type   e g   Sender   For more information see   boto3 error handling botocore error handling   Updated  2018-03-07  The AWS Python SDK has begun to expose service exceptions on clients  though not on resources  that you can explicitly catch  so it is now possible to write that code like this  import botocore import boto3  try      iam   boto3 client  iam       user   iam create user UserName  fred       print  quot Created user   s quot    user  except iam exceptions EntityAlreadyExistsException      print  quot User already exists quot   except botocore exceptions ParamValidationError as e      print  quot Parameter validation error   s quot    e  except botocore exceptions ClientError as e      print  quot Unexpected error   s quot    e   Unfortunately  there is currently no documentation for these exceptions but you can get a list of them as follows  import botocore import boto3 dir botocore exceptions   Note that you must import both botocore and boto3  If you only import botocore then you will find that botocore has no attribute named exceptions  This is because the exceptions are dynamically populated into botocore by boto3

User · Answer

As a few others already mentioned  you can catch certain errors using the service client  service client exceptions  lt ExceptionClass gt   or resource  service resource meta client exceptions  lt ExceptionClass gt    however it is not well documented  also which exceptions belong to which clients   So here is how to get the complete mapping at time of writing  January 2020  in region EU  Ireland   eu-west-1    import boto3  pprint  region name    eu-west-1  session   boto3 Session region name region name  exceptions       service  list boto3 client  sts   exceptions  code to exception    for service in session get available services     pprint pprint exceptions  width 20000    Here is a subset of the pretty large document     acm     InvalidArnException    InvalidDomainValidationOptionsException    InvalidStateException    InvalidTagException    LimitExceededException    RequestInProgressException    ResourceInUseException    ResourceNotFoundException    TooManyTagsException      apigateway     BadRequestException    ConflictException    LimitExceededException    NotFoundException    ServiceUnavailableException    TooManyRequestsException    UnauthorizedException      athena     InternalServerException    InvalidRequestException    TooManyRequestsException      autoscaling     AlreadyExists    InvalidNextToken    LimitExceeded    ResourceContention    ResourceInUse    ScalingActivityInProgress    ServiceLinkedRoleFailure      cloudformation     AlreadyExistsException    ChangeSetNotFound    CreatedButModifiedException    InsufficientCapabilitiesException    InvalidChangeSetStatus    InvalidOperationException    LimitExceededException    NameAlreadyExistsException    OperationIdAlreadyExistsException    OperationInProgressException    OperationNotFoundException    StackInstanceNotFoundException    StackSetNotEmptyException    StackSetNotFoundException    StaleRequestException    TokenAlreadyExistsException      cloudfront     AccessDenied    BatchTooLarge    CNAMEAlreadyExists    CannotChangeImmutablePublicKeyFields    CloudFrontOriginAccessIdentityAlreadyExists    CloudFrontOriginAccessIdentityInUse    DistributionAlreadyExists    DistributionNotDisabled    FieldLevelEncryptionConfigAlreadyExists    FieldLevelEncryptionConfigInUse    FieldLevelEncryptionProfileAlreadyExists    FieldLevelEncryptionProfileInUse    FieldLevelEncryptionProfileSizeExceeded    IllegalFieldLevelEncryptionConfigAssociationWithCacheBehavior    IllegalUpdate    InconsistentQuantities    InvalidArgument    InvalidDefaultRootObject    InvalidErrorCode    InvalidForwardCookies    InvalidGeoRestrictionParameter    InvalidHeadersForS3Origin    InvalidIfMatchVersion    InvalidLambdaFunctionAssociation    InvalidLocationCode    InvalidMinimumProtocolVersion    InvalidOrigin    InvalidOriginAccessIdentity    InvalidOriginKeepaliveTimeout    InvalidOriginReadTimeout    InvalidProtocolSettings    InvalidQueryStringParameters    InvalidRelativePath    InvalidRequiredProtocol    InvalidResponseCode    InvalidTTLOrder    InvalidTagging    InvalidViewerCertificate    InvalidWebACLId    MissingBody    NoSuchCloudFrontOriginAccessIdentity    NoSuchDistribution    NoSuchFieldLevelEncryptionConfig    NoSuchFieldLevelEncryptionProfile    NoSuchInvalidation    NoSuchOrigin    NoSuchPublicKey    NoSuchResource    NoSuchStreamingDistribution    PreconditionFailed    PublicKeyAlreadyExists    PublicKeyInUse    QueryArgProfileEmpty    StreamingDistributionAlreadyExists    StreamingDistributionNotDisabled    TooManyCacheBehaviors    TooManyCertificates    TooManyCloudFrontOriginAccessIdentities    TooManyCookieNamesInWhiteList    TooManyDistributionCNAMEs    TooManyDistributions    TooManyDistributionsAssociatedToFieldLevelEncryptionConfig    TooManyDistributionsWithLambdaAssociations    TooManyFieldLevelEncryptionConfigs    TooManyFieldLevelEncryptionContentTypeProfiles    TooManyFieldLevelEncryptionEncryptionEntities    TooManyFieldLevelEncryptionFieldPatterns    TooManyFieldLevelEncryptionProfiles    TooManyFieldLevelEncryptionQueryArgProfiles    TooManyHeadersInForwardedValues    TooManyInvalidationsInProgress    TooManyLambdaFunctionAssociations    TooManyOriginCustomHeaders    TooManyOriginGroupsPerDistribution    TooManyOrigins    TooManyPublicKeys    TooManyQueryStringParameters    TooManyStreamingDistributionCNAMEs    TooManyStreamingDistributions    TooManyTrustedSigners    TrustedSignerDoesNotExist      cloudtrail     CloudTrailARNInvalidException    CloudTrailAccessNotEnabledException    CloudWatchLogsDeliveryUnavailableException    InsufficientDependencyServiceAccessPermissionException    InsufficientEncryptionPolicyException    InsufficientS3BucketPolicyException    InsufficientSnsTopicPolicyException    InvalidCloudWatchLogsLogGroupArnException    InvalidCloudWatchLogsRoleArnException    InvalidEventSelectorsException    InvalidHomeRegionException    InvalidKmsKeyIdException    InvalidLookupAttributesException    InvalidMaxResultsException    InvalidNextTokenException    InvalidParameterCombinationException    InvalidS3BucketNameException    InvalidS3PrefixException    InvalidSnsTopicNameException    InvalidTagParameterException    InvalidTimeRangeException    InvalidTokenException    InvalidTrailNameException    KmsException    KmsKeyDisabledException    KmsKeyNotFoundException    MaximumNumberOfTrailsExceededException    NotOrganizationMasterAccountException    OperationNotPermittedException    OrganizationNotInAllFeaturesModeException    OrganizationsNotInUseException    ResourceNotFoundException    ResourceTypeNotSupportedException    S3BucketDoesNotExistException    TagsLimitExceededException    TrailAlreadyExistsException    TrailNotFoundException    TrailNotProvidedException    UnsupportedOperationException      cloudwatch     InvalidParameterInput    ResourceNotFound    InternalServiceError    InvalidFormat    InvalidNextToken    InvalidParameterCombination    InvalidParameterValue    LimitExceeded    MissingParameter      codebuild     AccountLimitExceededException    InvalidInputException    OAuthProviderException    ResourceAlreadyExistsException    ResourceNotFoundException      config     InsufficientDeliveryPolicyException    InsufficientPermissionsException    InvalidConfigurationRecorderNameException    InvalidDeliveryChannelNameException    InvalidLimitException    InvalidNextTokenException    InvalidParameterValueException    InvalidRecordingGroupException    InvalidResultTokenException    InvalidRoleException    InvalidS3KeyPrefixException    InvalidSNSTopicARNException    InvalidTimeRangeException    LastDeliveryChannelDeleteFailedException    LimitExceededException    MaxNumberOfConfigRulesExceededException    MaxNumberOfConfigurationRecordersExceededException    MaxNumberOfDeliveryChannelsExceededException    MaxNumberOfRetentionConfigurationsExceededException    NoAvailableConfigurationRecorderException    NoAvailableDeliveryChannelException    NoAvailableOrganizationException    NoRunningConfigurationRecorderException    NoSuchBucketException    NoSuchConfigRuleException    NoSuchConfigurationAggregatorException    NoSuchConfigurationRecorderException    NoSuchDeliveryChannelException    NoSuchRetentionConfigurationException    OrganizationAccessDeniedException    OrganizationAllFeaturesNotEnabledException    OversizedConfigurationItemException    ResourceInUseException    ResourceNotDiscoveredException    ValidationException      dynamodb     BackupInUseException    BackupNotFoundException    ConditionalCheckFailedException    ContinuousBackupsUnavailableException    GlobalTableAlreadyExistsException    GlobalTableNotFoundException    IdempotentParameterMismatchException    IndexNotFoundException    InternalServerError    InvalidRestoreTimeException    ItemCollectionSizeLimitExceededException    LimitExceededException    PointInTimeRecoveryUnavailableException    ProvisionedThroughputExceededException    ReplicaAlreadyExistsException    ReplicaNotFoundException    RequestLimitExceeded    ResourceInUseException    ResourceNotFoundException    TableAlreadyExistsException    TableInUseException    TableNotFoundException    TransactionCanceledException    TransactionConflictException    TransactionInProgressException      ec2         ecr     EmptyUploadException    ImageAlreadyExistsException    ImageNotFoundException    InvalidLayerException    InvalidLayerPartException    InvalidParameterException    InvalidTagParameterException    LayerAlreadyExistsException    LayerInaccessibleException    LayerPartTooSmallException    LayersNotFoundException    LifecyclePolicyNotFoundException    LifecyclePolicyPreviewInProgressException    LifecyclePolicyPreviewNotFoundException    LimitExceededException    RepositoryAlreadyExistsException    RepositoryNotEmptyException    RepositoryNotFoundException    RepositoryPolicyNotFoundException    ServerException    TooManyTagsException    UploadNotFoundException      ecs     AccessDeniedException    AttributeLimitExceededException    BlockedException    ClientException    ClusterContainsContainerInstancesException    ClusterContainsServicesException    ClusterContainsTasksException    ClusterNotFoundException    InvalidParameterException    MissingVersionException    NoUpdateAvailableException    PlatformTaskDefinitionIncompatibilityException    PlatformUnknownException    ResourceNotFoundException    ServerException    ServiceNotActiveException    ServiceNotFoundException    TargetNotFoundException    UnsupportedFeatureException    UpdateInProgressException      efs     BadRequest    DependencyTimeout    FileSystemAlreadyExists    FileSystemInUse    FileSystemLimitExceeded    FileSystemNotFound    IncorrectFileSystemLifeCycleState    IncorrectMountTargetState    InsufficientThroughputCapacity    InternalServerError    IpAddressInUse    MountTargetConflict    MountTargetNotFound    NetworkInterfaceLimitExceeded    NoFreeAddressesInSubnet    SecurityGroupLimitExceeded    SecurityGroupNotFound    SubnetNotFound    ThroughputLimitExceeded    TooManyRequests    UnsupportedAvailabilityZone      eks     ClientException    InvalidParameterException    InvalidRequestException    ResourceInUseException    ResourceLimitExceededException    ResourceNotFoundException    ServerException    ServiceUnavailableException    UnsupportedAvailabilityZoneException      elasticache     APICallRateForCustomerExceeded    AuthorizationAlreadyExists    AuthorizationNotFound    CacheClusterAlreadyExists    CacheClusterNotFound    CacheParameterGroupAlreadyExists    CacheParameterGroupNotFound    CacheParameterGroupQuotaExceeded    CacheSecurityGroupAlreadyExists    CacheSecurityGroupNotFound    QuotaExceeded CacheSecurityGroup    CacheSubnetGroupAlreadyExists    CacheSubnetGroupInUse    CacheSubnetGroupNotFoundFault    CacheSubnetGroupQuotaExceeded    CacheSubnetQuotaExceededFault    ClusterQuotaForCustomerExceeded    InsufficientCacheClusterCapacity    InvalidARN    InvalidCacheClusterState    InvalidCacheParameterGroupState    InvalidCacheSecurityGroupState    InvalidParameterCombination    InvalidParameterValue    InvalidReplicationGroupState    InvalidSnapshotState    InvalidSubnet    InvalidVPCNetworkStateFault    NoOperationFault    NodeGroupNotFoundFault    NodeGroupsPerReplicationGroupQuotaExceeded    NodeQuotaForClusterExceeded    NodeQuotaForCustomerExceeded    ReplicationGroupAlreadyExists    ReplicationGroupNotFoundFault    ReservedCacheNodeAlreadyExists    ReservedCacheNodeNotFound    ReservedCacheNodeQuotaExceeded    ReservedCacheNodesOfferingNotFound    ServiceLinkedRoleNotFoundFault    SnapshotAlreadyExistsFault    SnapshotFeatureNotSupportedFault    SnapshotNotFoundFault    SnapshotQuotaExceededFault    SubnetInUse    TagNotFound    TagQuotaPerResourceExceeded    TestFailoverNotAvailableFault      elasticbeanstalk     CodeBuildNotInServiceRegionException    ElasticBeanstalkServiceException    InsufficientPrivilegesException    InvalidRequestException    ManagedActionInvalidStateException    OperationInProgressFailure    PlatformVersionStillReferencedException    ResourceNotFoundException    ResourceTypeNotSupportedException    S3LocationNotInServiceRegionException    S3SubscriptionRequiredException    SourceBundleDeletionFailure    TooManyApplicationVersionsException    TooManyApplicationsException    TooManyBucketsException    TooManyConfigurationTemplatesException    TooManyEnvironmentsException    TooManyPlatformsException    TooManyTagsException      elb     LoadBalancerNotFound    CertificateNotFound    DependencyThrottle    DuplicateLoadBalancerName    DuplicateListener    DuplicatePolicyName    DuplicateTagKeys    InvalidConfigurationRequest    InvalidInstance    InvalidScheme    InvalidSecurityGroup    InvalidSubnet    ListenerNotFound    LoadBalancerAttributeNotFound    OperationNotPermitted    PolicyNotFound    PolicyTypeNotFound    SubnetNotFound    TooManyLoadBalancers    TooManyPolicies    TooManyTags    UnsupportedProtocol      emr     InternalServerError    InternalServerException    InvalidRequestException      es     BaseException    DisabledOperationException    InternalException    InvalidTypeException    LimitExceededException    ResourceAlreadyExistsException    ResourceNotFoundException    ValidationException      events     ConcurrentModificationException    InternalException    InvalidEventPatternException    LimitExceededException    ManagedRuleException    PolicyLengthExceededException    ResourceNotFoundException      firehose     ConcurrentModificationException    InvalidArgumentException    LimitExceededException    ResourceInUseException    ResourceNotFoundException    ServiceUnavailableException      glacier     InsufficientCapacityException    InvalidParameterValueException    LimitExceededException    MissingParameterValueException    PolicyEnforcedException    RequestTimeoutException    ResourceNotFoundException    ServiceUnavailableException      glue     AccessDeniedException    AlreadyExistsException    ConcurrentModificationException    ConcurrentRunsExceededException    ConditionCheckFailureException    CrawlerNotRunningException    CrawlerRunningException    CrawlerStoppingException    EntityNotFoundException    GlueEncryptionException    IdempotentParameterMismatchException    InternalServiceException    InvalidInputException    NoScheduleException    OperationTimeoutException    ResourceNumberLimitExceededException    SchedulerNotRunningException    SchedulerRunningException    SchedulerTransitioningException    ValidationException    VersionMismatchException      iam     ConcurrentModification    ReportExpired    ReportNotPresent    ReportInProgress    DeleteConflict    DuplicateCertificate    DuplicateSSHPublicKey    EntityAlreadyExists    EntityTemporarilyUnmodifiable    InvalidAuthenticationCode    InvalidCertificate    InvalidInput    InvalidPublicKey    InvalidUserType    KeyPairMismatch    LimitExceeded    MalformedCertificate    MalformedPolicyDocument    NoSuchEntity    PasswordPolicyViolation    PolicyEvaluation    PolicyNotAttachable    ServiceFailure    NotSupportedService    UnmodifiableEntity    UnrecognizedPublicKeyEncoding      kinesis     ExpiredIteratorException    ExpiredNextTokenException    InternalFailureException    InvalidArgumentException    KMSAccessDeniedException    KMSDisabledException    KMSInvalidStateException    KMSNotFoundException    KMSOptInRequired    KMSThrottlingException    LimitExceededException    ProvisionedThroughputExceededException    ResourceInUseException    ResourceNotFoundException      kms     AlreadyExistsException    CloudHsmClusterInUseException    CloudHsmClusterInvalidConfigurationException    CloudHsmClusterNotActiveException    CloudHsmClusterNotFoundException    CloudHsmClusterNotRelatedException    CustomKeyStoreHasCMKsException    CustomKeyStoreInvalidStateException    CustomKeyStoreNameInUseException    CustomKeyStoreNotFoundException    DependencyTimeoutException    DisabledException    ExpiredImportTokenException    IncorrectKeyMaterialException    IncorrectTrustAnchorException    InvalidAliasNameException    InvalidArnException    InvalidCiphertextException    InvalidGrantIdException    InvalidGrantTokenException    InvalidImportTokenException    InvalidKeyUsageException    InvalidMarkerException    KMSInternalException    KMSInvalidStateException    KeyUnavailableException    LimitExceededException    MalformedPolicyDocumentException    NotFoundException    TagException    UnsupportedOperationException      lambda     CodeStorageExceededException    EC2AccessDeniedException    EC2ThrottledException    EC2UnexpectedException    ENILimitReachedException    InvalidParameterValueException    InvalidRequestContentException    InvalidRuntimeException    InvalidSecurityGroupIDException    InvalidSubnetIDException    InvalidZipFileException    KMSAccessDeniedException    KMSDisabledException    KMSInvalidStateException    KMSNotFoundException    PolicyLengthExceededException    PreconditionFailedException    RequestTooLargeException    ResourceConflictException    ResourceInUseException    ResourceNotFoundException    ServiceException    SubnetIPAddressLimitReachedException    TooManyRequestsException    UnsupportedMediaTypeException      logs     DataAlreadyAcceptedException    InvalidOperationException    InvalidParameterException    InvalidSequenceTokenException    LimitExceededException    MalformedQueryException    OperationAbortedException    ResourceAlreadyExistsException    ResourceNotFoundException    ServiceUnavailableException    UnrecognizedClientException      neptune     AuthorizationNotFound    CertificateNotFound    DBClusterAlreadyExistsFault    DBClusterNotFoundFault    DBClusterParameterGroupNotFound    DBClusterQuotaExceededFault    DBClusterRoleAlreadyExists    DBClusterRoleNotFound    DBClusterRoleQuotaExceeded    DBClusterSnapshotAlreadyExistsFault    DBClusterSnapshotNotFoundFault    DBInstanceAlreadyExists    DBInstanceNotFound    DBParameterGroupAlreadyExists    DBParameterGroupNotFound    DBParameterGroupQuotaExceeded    DBSecurityGroupNotFound    DBSnapshotAlreadyExists    DBSnapshotNotFound    DBSubnetGroupAlreadyExists    DBSubnetGroupDoesNotCoverEnoughAZs    DBSubnetGroupNotFoundFault    DBSubnetGroupQuotaExceeded    DBSubnetQuotaExceededFault    DBUpgradeDependencyFailure    DomainNotFoundFault    EventSubscriptionQuotaExceeded    InstanceQuotaExceeded    InsufficientDBClusterCapacityFault    InsufficientDBInstanceCapacity    InsufficientStorageClusterCapacity    InvalidDBClusterSnapshotStateFault    InvalidDBClusterStateFault    InvalidDBInstanceState    InvalidDBParameterGroupState    InvalidDBSecurityGroupState    InvalidDBSnapshotState    InvalidDBSubnetGroupStateFault    InvalidDBSubnetStateFault    InvalidEventSubscriptionState    InvalidRestoreFault    InvalidSubnet    InvalidVPCNetworkStateFault    KMSKeyNotAccessibleFault    OptionGroupNotFoundFault    ProvisionedIopsNotAvailableInAZFault    ResourceNotFoundFault    SNSInvalidTopic    SNSNoAuthorization    SNSTopicArnNotFound    SharedSnapshotQuotaExceeded    SnapshotQuotaExceeded    SourceNotFound    StorageQuotaExceeded    StorageTypeNotSupported    SubnetAlreadyInUse    SubscriptionAlreadyExist    SubscriptionCategoryNotFound    SubscriptionNotFound      rds     AuthorizationAlreadyExists    AuthorizationNotFound    AuthorizationQuotaExceeded    BackupPolicyNotFoundFault    CertificateNotFound    DBClusterAlreadyExistsFault    DBClusterBacktrackNotFoundFault    DBClusterEndpointAlreadyExistsFault    DBClusterEndpointNotFoundFault    DBClusterEndpointQuotaExceededFault    DBClusterNotFoundFault    DBClusterParameterGroupNotFound    DBClusterQuotaExceededFault    DBClusterRoleAlreadyExists    DBClusterRoleNotFound    DBClusterRoleQuotaExceeded    DBClusterSnapshotAlreadyExistsFault    DBClusterSnapshotNotFoundFault    DBInstanceAlreadyExists    DBInstanceAutomatedBackupNotFound    DBInstanceAutomatedBackupQuotaExceeded    DBInstanceNotFound    DBInstanceRoleAlreadyExists    DBInstanceRoleNotFound    DBInstanceRoleQuotaExceeded    DBLogFileNotFoundFault    DBParameterGroupAlreadyExists    DBParameterGroupNotFound    DBParameterGroupQuotaExceeded    DBSecurityGroupAlreadyExists    DBSecurityGroupNotFound    DBSecurityGroupNotSupported    QuotaExceeded DBSecurityGroup    DBSnapshotAlreadyExists    DBSnapshotNotFound    DBSubnetGroupAlreadyExists    DBSubnetGroupDoesNotCoverEnoughAZs    DBSubnetGroupNotAllowedFault    DBSubnetGroupNotFoundFault    DBSubnetGroupQuotaExceeded    DBSubnetQuotaExceededFault    DBUpgradeDependencyFailure    DomainNotFoundFault    EventSubscriptionQuotaExceeded    GlobalClusterAlreadyExistsFault    GlobalClusterNotFoundFault    GlobalClusterQuotaExceededFault    InstanceQuotaExceeded    InsufficientDBClusterCapacityFault    InsufficientDBInstanceCapacity    InsufficientStorageClusterCapacity    InvalidDBClusterCapacityFault    InvalidDBClusterEndpointStateFault    InvalidDBClusterSnapshotStateFault    InvalidDBClusterStateFault    InvalidDBInstanceAutomatedBackupState    InvalidDBInstanceState    InvalidDBParameterGroupState    InvalidDBSecurityGroupState    InvalidDBSnapshotState    InvalidDBSubnetGroupFault    InvalidDBSubnetGroupStateFault    InvalidDBSubnetStateFault    InvalidEventSubscriptionState    InvalidGlobalClusterStateFault    InvalidOptionGroupStateFault    InvalidRestoreFault    InvalidS3BucketFault    InvalidSubnet    InvalidVPCNetworkStateFault    KMSKeyNotAccessibleFault    OptionGroupAlreadyExistsFault    OptionGroupNotFoundFault    OptionGroupQuotaExceededFault    PointInTimeRestoreNotEnabled    ProvisionedIopsNotAvailableInAZFault    ReservedDBInstanceAlreadyExists    ReservedDBInstanceNotFound    ReservedDBInstanceQuotaExceeded    ReservedDBInstancesOfferingNotFound    ResourceNotFoundFault    SNSInvalidTopic    SNSNoAuthorization    SNSTopicArnNotFound    SharedSnapshotQuotaExceeded    SnapshotQuotaExceeded    SourceNotFound    StorageQuotaExceeded    StorageTypeNotSupported    SubnetAlreadyInUse    SubscriptionAlreadyExist    SubscriptionCategoryNotFound    SubscriptionNotFound      route53     ConcurrentModification    ConflictingDomainExists    ConflictingTypes    DelegationSetAlreadyCreated    DelegationSetAlreadyReusable    DelegationSetInUse    DelegationSetNotAvailable    DelegationSetNotReusable    HealthCheckAlreadyExists    HealthCheckInUse    HealthCheckVersionMismatch    HostedZoneAlreadyExists    HostedZoneNotEmpty    HostedZoneNotFound    HostedZoneNotPrivate    IncompatibleVersion    InsufficientCloudWatchLogsResourcePolicy    InvalidArgument    InvalidChangeBatch    InvalidDomainName    InvalidInput    InvalidPaginationToken    InvalidTrafficPolicyDocument    InvalidVPCId    LastVPCAssociation    LimitsExceeded    NoSuchChange    NoSuchCloudWatchLogsLogGroup    NoSuchDelegationSet    NoSuchGeoLocation    NoSuchHealthCheck    NoSuchHostedZone    NoSuchQueryLoggingConfig    NoSuchTrafficPolicy    NoSuchTrafficPolicyInstance    NotAuthorizedException    PriorRequestNotComplete    PublicZoneVPCAssociation    QueryLoggingConfigAlreadyExists    ThrottlingException    TooManyHealthChecks    TooManyHostedZones    TooManyTrafficPolicies    TooManyTrafficPolicyInstances    TooManyTrafficPolicyVersionsForCurrentPolicy    TooManyVPCAssociationAuthorizations    TrafficPolicyAlreadyExists    TrafficPolicyInUse    TrafficPolicyInstanceAlreadyExists    VPCAssociationAuthorizationNotFound    VPCAssociationNotFound      s3     BucketAlreadyExists    BucketAlreadyOwnedByYou    NoSuchBucket    NoSuchKey    NoSuchUpload    ObjectAlreadyInActiveTierError    ObjectNotInActiveTierError      sagemaker     ResourceInUse    ResourceLimitExceeded    ResourceNotFound      secretsmanager     DecryptionFailure    EncryptionFailure    InternalServiceError    InvalidNextTokenException    InvalidParameterException    InvalidRequestException    LimitExceededException    MalformedPolicyDocumentException    PreconditionNotMetException    ResourceExistsException    ResourceNotFoundException      ses     AccountSendingPausedException    AlreadyExists    CannotDelete    ConfigurationSetAlreadyExists    ConfigurationSetDoesNotExist    ConfigurationSetSendingPausedException    CustomVerificationEmailInvalidContent    CustomVerificationEmailTemplateAlreadyExists    CustomVerificationEmailTemplateDoesNotExist    EventDestinationAlreadyExists    EventDestinationDoesNotExist    FromEmailAddressNotVerified    InvalidCloudWatchDestination    InvalidConfigurationSet    InvalidFirehoseDestination    InvalidLambdaFunction    InvalidPolicy    InvalidRenderingParameter    InvalidS3Configuration    InvalidSNSDestination    InvalidSnsTopic    InvalidTemplate    InvalidTrackingOptions    LimitExceeded    MailFromDomainNotVerifiedException    MessageRejected    MissingRenderingAttribute    ProductionAccessNotGranted    RuleDoesNotExist    RuleSetDoesNotExist    TemplateDoesNotExist    TrackingOptionsAlreadyExistsException    TrackingOptionsDoesNotExistException      sns     AuthorizationError    EndpointDisabled    FilterPolicyLimitExceeded    InternalError    InvalidParameter    ParameterValueInvalid    InvalidSecurity    KMSAccessDenied    KMSDisabled    KMSInvalidState    KMSNotFound    KMSOptInRequired    KMSThrottling    NotFound    PlatformApplicationDisabled    SubscriptionLimitExceeded    Throttled    TopicLimitExceeded      sqs     AWS SimpleQueueService BatchEntryIdsNotDistinct    AWS SimpleQueueService BatchRequestTooLong    AWS SimpleQueueService EmptyBatchRequest    InvalidAttributeName    AWS SimpleQueueService InvalidBatchEntryId    InvalidIdFormat    InvalidMessageContents    AWS SimpleQueueService MessageNotInflight    OverLimit    AWS SimpleQueueService PurgeQueueInProgress    AWS SimpleQueueService QueueDeletedRecently    AWS SimpleQueueService NonExistentQueue    QueueAlreadyExists    ReceiptHandleIsInvalid    AWS SimpleQueueService TooManyEntriesInBatchRequest    AWS SimpleQueueService UnsupportedOperation      ssm     AlreadyExistsException    AssociatedInstances    AssociationAlreadyExists    AssociationDoesNotExist    AssociationExecutionDoesNotExist    AssociationLimitExceeded    AssociationVersionLimitExceeded    AutomationDefinitionNotFoundException    AutomationDefinitionVersionNotFoundException    AutomationExecutionLimitExceededException    AutomationExecutionNotFoundException    AutomationStepNotFoundException    ComplianceTypeCountLimitExceededException    CustomSchemaCountLimitExceededException    DocumentAlreadyExists    DocumentLimitExceeded    DocumentPermissionLimit    DocumentVersionLimitExceeded    DoesNotExistException    DuplicateDocumentContent    DuplicateDocumentVersionName    DuplicateInstanceId    FeatureNotAvailableException    HierarchyLevelLimitExceededException    HierarchyTypeMismatchException    IdempotentParameterMismatch    InternalServerError    InvalidActivation    InvalidActivationId    InvalidAggregatorException    InvalidAllowedPatternException    InvalidAssociation    InvalidAssociationVersion    InvalidAutomationExecutionParametersException    InvalidAutomationSignalException    InvalidAutomationStatusUpdateException    InvalidCommandId    InvalidDeleteInventoryParametersException    InvalidDeletionIdException    InvalidDocument    InvalidDocumentContent    InvalidDocumentOperation    InvalidDocumentSchemaVersion    InvalidDocumentVersion    InvalidFilter    InvalidFilterKey    InvalidFilterOption    InvalidFilterValue    InvalidInstanceId    InvalidInstanceInformationFilterValue    InvalidInventoryGroupException    InvalidInventoryItemContextException    InvalidInventoryRequestException    InvalidItemContentException    InvalidKeyId    InvalidNextToken    InvalidNotificationConfig    InvalidOptionException    InvalidOutputFolder    InvalidOutputLocation    InvalidParameters    InvalidPermissionType    InvalidPluginName    InvalidResourceId    InvalidResourceType    InvalidResultAttributeException    InvalidRole    InvalidSchedule    InvalidTarget    InvalidTypeNameException    InvalidUpdate    InvocationDoesNotExist    ItemContentMismatchException    ItemSizeLimitExceededException    MaxDocumentSizeExceeded    ParameterAlreadyExists    ParameterLimitExceeded    ParameterMaxVersionLimitExceeded    ParameterNotFound    ParameterPatternMismatchException    ParameterVersionLabelLimitExceeded    ParameterVersionNotFound    ResourceDataSyncAlreadyExistsException    ResourceDataSyncCountExceededException    ResourceDataSyncInvalidConfigurationException    ResourceDataSyncNotFoundException    ResourceInUseException    ResourceLimitExceededException    StatusUnchanged    SubTypeCountLimitExceededException    TargetInUseException    TargetNotConnected    TooManyTagsError    TooManyUpdates    TotalSizeLimitExceededException    UnsupportedInventoryItemContextException    UnsupportedInventorySchemaVersionException    UnsupportedOperatingSystem    UnsupportedParameterType    UnsupportedPlatformType      stepfunctions     ActivityDoesNotExist    ActivityLimitExceeded    ActivityWorkerLimitExceeded    ExecutionAlreadyExists    ExecutionDoesNotExist    ExecutionLimitExceeded    InvalidArn    InvalidDefinition    InvalidExecutionInput    InvalidName    InvalidOutput    InvalidToken    MissingRequiredParameter    ResourceNotFound    StateMachineAlreadyExists    StateMachineDeleting    StateMachineDoesNotExist    StateMachineLimitExceeded    TaskDoesNotExist    TaskTimedOut    TooManyTags      sts     ExpiredTokenException    IDPCommunicationError    IDPRejectedClaim    InvalidAuthorizationMessageException    InvalidIdentityToken    MalformedPolicyDocument    PackedPolicyTooLarge    RegionDisabledException      xray     InvalidRequestException    RuleLimitExceededException    ThrottledException

User · Answer

Only one import needed  No if statement needed  Use the client built-in exception as intended   Ex  from boto3 import client  cli   client  iam   try      cli create user          UserName    Brian        except cli exceptions EntityAlreadyExistsException      pass  a CloudWatch example  cli   client  logs   try      cli create log group          logGroupName    MyLogGroup        except cli exceptions ResourceAlreadyExistsException      pass

User · Answer

You need to do something when it fails to handle the issue   Right now you are returning the actual exception   For example  if its not a problem that the user exists already and you want to use it as a get or create function maybe you handle the issue by returning the existing user object   try      user   iam conn create user UserName username      return user except botocore exceptions ClientError as e        this exception could actually be other things other than exists  so you want to evaluate it further in your real code      if e message startswith           enough of the exception message to identify it as the one you want            print  that user already exists            user   iam conn get user UserName username          return user      elif e message some other condition             something else     else            unhandled ClientError          raise e  except SomeOtherExceptionTypeYouCareAbout as e       handle it    any unhandled exception will raise here at this point    if you want a general handler  except Exception as e       handle it    That said  maybe it is a problem for your app  in which case you want to want to put the exception handler around the code that called your create user function and let the calling function determine how to deal with it  for example  by asking the user to input another username  or whatever makes sense for your application

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Just an update to the  no exceptions on resources  problem as pointed to by  jarmod  do please feel free to update your answer if below seems applicable   I have tested the below code and it runs fine  It uses  resources  for doing things  but catches the client exceptions - although it  looks  somewhat wrong    it tests good  the exception classes are showing and matching when looked into using debugger at exception time      It may not be applicable to all resources and clients  but works for data folders  aka s3 buckets    lab session   boto3 Session    c   lab session client  s3    this client is only for exception catching  try      b   s3 Bucket bucket      b delete   except c exceptions NoSuchBucket as e       ignoring no such bucket exceptions     logger debug  Failed deleting bucket  Continuing      format e   except Exception as e       logging all the others as warning     logger warning  Failed deleting bucket  Continuing      format e     Hope this helps

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Or a comparison on the class name e g   except ClientError as e      if  EntityAlreadyExistsException     e   class     name              handle specific error   Because they are dynamically created you can never import the class and catch it using real Python

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If you are calling the sign up API  AWS Cognito  using Python3  you can use the following code    def registerUser userObj           Registers the user to AWS Cognito                 Mobile number is not a mandatory field       if len userObj  user mob no       0           mobilenumber          else          mobilenumber   userObj  user country code   userObj  user mob no        secretKey   bytes settings SOCIAL AUTH COGNITO SECRET   latin-1       clientId   settings SOCIAL AUTH COGNITO KEY       digest   hmac new secretKey                  msg  userObj  user name     clientId  encode  utf-8                    digestmod hashlib sha256                   digest       signature   base64 b64encode digest  decode        client   boto3 client  cognito-idp   region name  eu-west-1          try          response   client sign up                      ClientId clientId                      Username userObj  user name                        Password userObj  password1                        SecretHash signature                      UserAttributes                                                          Name    given name                                Value   userObj  given name                                                                                     Name    family name                                Value   userObj  family name                                                                                     Name    email                                Value   userObj  user email                                                                                     Name    phone number                                Value   mobilenumber                                                                      ValidationData                                                          Name    email                                Value   userObj  user email                                                                                              AnalyticsMetadata                            AnalyticsEndpointId    string                                             UserContextData                            EncodedData    string                                              except ClientError as error          return   errorcode   error response  Error    Code                 errormessage    error response  Error    Message         except Exception as e          return   errorcode    Something went wrong  Try later or contact the admin        return   success    User registered successfully       error response  Error    Code   will be InvalidPasswordException  UsernameExistsException etc  So in the main function or where you are calling the function  you can write the logic to provide a meaningful message to the user    An example for the response  error response          Error          Message    Password did not conform with policy  Password must have symbol characters        Code    InvalidPasswordException          ResponseMetadata          RequestId    c8a591d5-8c51-4af9-8fad-b38b270c3ca2        HTTPStatusCode   400       HTTPHeaders            date    Wed  17 Jul 2019 09 38 32 GMT          content-type    application x-amz-json-1 1          content-length    124          connection    keep-alive          x-amzn-requestid    c8a591d5-8c51-4af9-8fad-b38b270c3ca2          x-amzn-errortype    InvalidPasswordException           x-amzn-errormessage    Password did not conform with policy  Password must have symbol characters              RetryAttempts   0         For further reference   https   boto3 amazonaws com v1 documentation api latest reference services cognito-idp html CognitoIdentityProvider Client sign up

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Following  armod s update about exceptions being added right on client objects  I ll show how you can see all exceptions defined for your client class   Exceptions are generated dynamically when you create your client with session create client   or boto3 client    Internally it calls method botocore errorfactory ClientExceptionsFactory  create client exceptions   and fills client exceptions field with constructed exception classes   All class names are available in client exceptions  code to exception dictionary  so you can list all types with following snippet   client   boto3 client  s3    for ex code in client exceptions  code to exception      print ex code    Hope it helps

[python] How to handle errors with boto3?

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