How to disable Python warnings

Question

I am working with code that throws a lot of  for me at the moment  useless warnings using the warnings library  Reading   scanning  the documentation I only found a way to disable warnings for single functions  But I don t want to change so much of the code  Is there a flag like python -no-warning foo py  What would you recommend

User · Answer

If you know what are the useless warnings you usually encounter  you can filter them by message   import warnings   ignore by message warnings filterwarnings  ignore   message  divide by zero encountered in divide     part of the message is also okay warnings filterwarnings  ignore   message  divide by zero encountered    warnings filterwarnings  ignore   message  invalid value encountered

User · Answer

import sys if not sys warnoptions      import warnings     warnings simplefilter  quot ignore quot    Change ignore to default when working on the file or adding new functionality to re-enable warnings

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I realise this is only applicable to a niche of the situations  but within a numpy context I really like using np errstate   np sqrt -1      main   1  RuntimeWarning  invalid value encountered in sqrt nan   However  using np errstate   with np errstate invalid  ignore        np sqrt -1    nan   The best part being you can apply this to very specific lines of code only

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If you don t want something complicated  then    import warnings warnings filterwarnings  ignore   category FutureWarning

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You can also define an environment variable  new feature in 2010 - i e  python 2 7   export PYTHONWARNINGS  ignore    Test like this  Default    export PYTHONWARNINGS  default    python  gt  gt  gt  import warnings  gt  gt  gt  warnings warn  my warning     main   1  UserWarning  my warning  gt  gt  gt    Ignore warnings    export PYTHONWARNINGS  ignore    python  gt  gt  gt  import warnings  gt  gt  gt  warnings warn  my warning    gt  gt  gt     For deprecation warnings have a look at how-to-ignore-deprecation-warnings-in-python  Copied here     From documentation of the warnings module       usr bin env python -W ignore  DeprecationWarning   If you re on Windows  pass -W ignore  DeprecationWarning as an argument to Python  Better though to resolve the issue  by casting to int    Note that in Python 3 2  deprecation warnings are ignored by default    Or   import warnings  with warnings catch warnings        warnings filterwarnings  ignore   category DeprecationWarning      import md5  sha  yourcode     Now you still get all the other DeprecationWarnings  but not the ones caused by   import md5  sha

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This is an old question but there is some newer guidance in PEP 565 that to turn off all warnings if you re writing a python application you should use   import sys import warnings  if not sys warnoptions      warnings simplefilter  ignore     The reason this is recommended is that it turns off all warnings by default but crucially allows them to be switched back on via python -W on the command line or PYTHONWARNINGS

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Look at the Temporarily Suppressing Warnings section of the Python docs   If you are using code that you know will raise a warning  such as a deprecated function  but do not want to see the warning  then it is possible to suppress the warning using the catch warnings context manager  import warnings  def fxn        warnings warn  quot deprecated quot   DeprecationWarning   with warnings catch warnings        warnings simplefilter  quot ignore quot       fxn     I don t condone it  but you could just suppress all warnings with this  import warnings warnings filterwarnings  quot ignore quot    Ex   gt  gt  gt  import warnings  gt  gt  gt  def f            print  before           warnings warn  you are warned            print  after        gt  gt  gt  f   before  lt stdin gt  3  UserWarning  you are warned  after  gt  gt  gt  warnings filterwarnings  quot ignore quot    gt  gt  gt  f   before after

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warnings are output via stderr and the simple solution is to append  2   dev null  to the CLI  this makes a lot of sense to many users such as those with centos 6 that are stuck with python 2 6 dependencies  like yum  and various modules are being pushed to the edge of extinction in their coverage   this is especially true for cryptography involving SNI et cetera  one can update 2 6 for HTTPS handling using the proc at  https   urllib3 readthedocs io en latest user-guide html ssl-py2  the warning is still in place  but everything you want is back-ported  the re-direct of stderr will leave you with clean terminal shell output although the stdout content itself does not change   responding to FriendFX  sentence one  1  responds directly to the problem with an universal solution  sentence two  2  takes into account the cited anchor re  disable warnings  which is python 2 6 specific and notes that RHEL centos 6 users cannot directly do without 2 6  although no specific warnings were cited  para two  2  answers the 2 6 question I most frequently get re the short-comings in the cryptography module and how one can  modernize   i e   upgrade  backport  fix  python s HTTPS TLS performance  para three  3  merely explains the outcome of using the re-direct and upgrading the module dependencies

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More pythonic way to ignore WARNINGS  Since  warning filterwarnings    is not suppressing all the warnings  i will suggest you to use the following method  import logging      for name in logging Logger manager loggerDict keys        logging getLogger name  setLevel logging CRITICAL    rest of the code starts here     OR  If you want to suppress only a specific set of warnings  then you can filter like this  import logging      for name in logging Logger manager loggerDict keys        if   boto  in name  or   urllib3  in name  or   s3transfer  in name  or   boto3  in name  or   botocore  in name  or   nose  in name               logging getLogger name  setLevel logging CRITICAL    rest of the code starts here

User · Answer

There s the -W option  python -W ignore foo py

[python] How to disable Python warnings?

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