How do I disable a Pylint warning

Question

I m trying to disable warning C0321   quot more than one statement on a single line quot  -- I often put if statements with short single-line results on the same line   in Pylint 0 21 1  if it matters  astng 0 20 1  common 0 50 3  and Python 2 6 6  r266 84292  Sep 15 2010  16 22 56    I ve tried adding disable C0321 in the Pylint configuration file  but Pylint insists on reporting it anyway  Variations on that line  like disable 0321 or disable C321  are flagged as errors  so Pylint does recognize the option properly  It s just ignoring it  Is this a Pylint bug  or am I doing something wrong  Is there a way around this  I d really like to get rid of some of this noise

User · Answer

As per Pylint documentation  the easiest is to use this chart   C convention-related checks R refactoring-related checks W various warnings E errors  for probable bugs in the code F fatal  if an error occurred which prevented Pylint from doing further processing   So one can use  pylint -j 0 --disable I E R W C F YOUR FILES LOC

User · Answer

You can also use the following command  pylint --disable C0321  test py  My Pylint version is 0 25 1

User · Answer

You just have to add one line to disable what you want to disable  E g    pylint  disable   line-too-long  too-many-lines  no-name-in-module  import-error  multiple-imports  pointless-string-statement  wrong-import-order  Add this at the very beginning of your module

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There are several ways to disable warnings  amp  errors from Pylint   Which one to use has to do with how globally or locally you want to apply the disablement -- an important design decision   Multiple Approaches   In one or more pylintrc files    This involves more than the    pylintrc file  in your  HOME directory  as described by Chris Morgan   Pylint will search for rc files  with a precedence that values  closer  files more highly    A pylintrc file in the current working directory  or If the current working directory is in a Python module  i e  it contains an   init   py file   searching up the hierarchy of Python modules until a pylintrc file is found  or The file named by the environment variable PYLINTRC  or If you have a home directory that isn   t  root       pylintrc  or    config pylintrc  or  etc pylintrc    Note that most of these files are named pylintrc -- only the file in   has a leading dot   To your pylintrc file  add lines to disable specific pylint messages  For example    MESSAGES CONTROL  disable locally-disabled    Further disables from the pylint command line  as described by Aboo and Cairnarvon   This looks like pylint --disable bad-builtin   Repeat --disable to suppress additional items  Further disables from individual Python code lines  as described by Imolit   These look like some statement   pylint  disable broad-except  extra comment on the end of the original source line  and apply only to the current line  My approach is to always put these on the end of other lines of code so they won t be confused with the block style  see below  Further disables defined for larger blocks of Python code  up to complete source files    These look like   pragma pylint  disable bad-whitespace  note the pragma key word   These apply to every line after the pragma   Putting a block of these at the top of a file makes the suppressions apply to the whole file  Putting the same block lower in the file makes them apply only to lines following the block  My approach is to always put these on a line of their own so they won t be confused with the single-line style  see above  When a suppression should only apply within a span of code  use   pragma pylint  enable bad-whitespace  now using enable not disable  to stop suppressing     Note that disabling for a single line uses the   pylint syntax while disabling for this line onward uses the   pragma pylint syntax  These are easy to confuse especially when copying  amp  pasting   Putting It All Together  I usually use a mix of these approaches    I use    pylintrc for absolutely global standards -- very few of these  I use project-level pylintrc at different levels within Python modules when there are project-specific standards   Especially when you re taking in code from another person or team  you may find they use conventions that you don t prefer  but you don t want to rework the code   Keeping the settings at this level helps not spread those practices to other projects  I use the block style pragmas at the top of single source files   I like to turn the pragmas off  stop suppressing messages  in the heat of development even for Pylint standards I don t agree with  like  too few public methods  -- I always get that warning on custom Exception classes  -- but it s helpful to see more   maybe all Pylint messages while you re developing   That way you can find the cases you want to address with single-line pragmas  see below   or just add comments for the next developer to explain why that warning is OK in this case  I leave some of the block-style pragmas enabled even when the code is ready to check in   I try to use few of those  but when it makes sense for the module  it s OK to do as documentation   However I try to leave as few on as possible  preferably none  I use the single-line-comment style to address especially potent errors   For example  if there s a place where it actually makes sense to do except Exception as exc  I put the   pylint  disable broad-except on that line instead of a more global approach because this is a strange exception and needs to be called out  basically as a form of documentation      Like everything else in Python  you can act at different levels of indirection   My advice is to think about what belongs at what level so you don t end up with a too-lenient approach to Pylint

User · Answer

Starting from Pylint v  0 25 3  you can use the symbolic names for disabling warnings instead of having to remember all those code numbers  E g     pylint  disable locally-disabled  multiple-statements  fixme  line-too-long  This style is more instructive than cryptic error codes  and also more practical since newer versions of Pylint only output the symbolic name  not the error code  The correspondence between symbolic names and codes can be found here  A disable comment can be inserted on its own line  applying the disable to everything that comes after in the same block  Alternatively  it can be inserted at the end of the line for which it is meant to apply  If Pylint outputs  quot Locally disabling quot  messages  you can get rid of them by including the disable locally-disabled first as in the example above

User · Answer

Python syntax does permit more than one statement on a line  separated by semicolon      However  limiting each line to one statement makes it easier for a human to follow a program s logic when reading through it  So  another way of solving this issue  is to understand why the lint message is there and not put more than one statement on a line  Yes  you may find it easier to write multiple statements per line  however  Pylint is for every other reader of your code not just you

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pylint --generate-rcfile shows it like this    MESSAGES CONTROL     Enable the message  report  category or checker with the given id s   You can   either give multiple identifier separated by comma     or put this option   multiple time   enable     Disable the message  report  category or checker with the given id s   You   can either give multiple identifier separated by comma     or put this option   multiple time  only on the command line  not in the configuration file where   it should appear only once    disable    So it looks like your    pylintrc should have the disable  line s in it inside a section  MESSAGES CONTROL

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Edit  quot C  Users Your User AppData Roaming Code User settings json quot  and add  python linting pylintArgs  with its lines at the end as shown below         quot team showWelcomeMessage quot   false       quot python dataScience sendSelectionToInteractiveWindow quot   true       quot git enableSmartCommit quot   true       quot powershell codeFormatting useCorrectCasing quot   true       quot files autoSave quot    quot onWindowChange quot        quot python linting pylintArgs quot              quot --load-plugins pylint django quot            quot --errors-only quot

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I had this problem using Eclipse and solved it as follows  In the pylint folder  e g  C  Python26 Lib site-packages pylint   hold Shift  right-click and choose to open the windows command in that folder  Type  lint py --generate-rcfile  gt  standard rc  This creates the standard rc configuration file  Open it in Notepad and under  MESSAGES CONTROL   uncomment disable  and add the message ID s you want to disable  e g   disable W0511  C0321  Save the file  and in Eclipse   Window   Preferences   PyDev    pylint  in the arguments box  type  --rcfile C  Python26 Lib site-packages pylint standard rc  Now it should work     You can also add a comment at the top of your code that will be interpreted by Pylint    pylint  disable C0321   Pylint message codes   Adding e g  --disable-ids C0321 in the arguments box does not work  All available Pylint messages are stored in the dictionary  messages  an attribute of an instance of the pylint utils MessagesHandlerMixIn class  When running Pylint with the argument --disable-ids      at least without a configuration file   this dictionary is initially empty  raising a KeyError exception within Pylint  pylint utils MessagesHandlerMixIn check message id    In Eclipse  you can see this error-message in the Pylint Console  windows    show view   Console   select Pylint console from the console options besides the console icon

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In case this helps someone  if you re using Visual Studio Code  it expects the file to be in UTF-8 encoding  To generate the file  I ran pylint --generate-rcfile   out-file -encoding utf8  pylintrc in PowerShell

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This is a FAQ   4 1 Is it possible to locally disable a particular message  Yes  this feature has been added in Pylint 0 11  This may be done by adding   pylint  disable some-message another-one at the desired block level or at the end of the desired line of code  4 2 Is there a way to disable a message for a particular module only  Yes  you can disable or enable  globally disabled  messages at the module level by adding the corresponding option in a comment at the top of the file    pylint  disable wildcard-import  method-hidden   pylint  enable too-many-lines   You can disable messages by   numerical ID  E1101  E1102  etc  symbolic message  no-member  undefined-variable  etc  the name of a group of checks  You can grab those with pylint --list-groups  category of checks  C  R  W  etc  all the checks with all   See the documentation  or run pylint --list-msgs in the terminal  for the full list of Pylint s messages  The documentation also provide a nice example of how to use this feature

User · Answer

To disable a warning locally in a block  add    pylint  disable C0321   to that block

[python] How do I disable a Pylint warning?

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