How to ignore deprecation warnings in Python

You should just fix your code but just in case,

import warnings
warnings.filterwarnings("ignore", category=DeprecationWarning) 

I had these:

/home/eddyp/virtualenv/lib/python2.6/site-packages/Twisted-8.2.0-py2.6-linux-x86_64.egg/twisted/persisted/sob.py:12:
DeprecationWarning: the md5 module is deprecated; use hashlib instead import os, md5, sys

/home/eddyp/virtualenv/lib/python2.6/site-packages/Twisted-8.2.0-py2.6-linux-x86_64.egg/twisted/python/filepath.py:12:
DeprecationWarning: the sha module is deprecated; use the hashlib module instead import sha

Fixed it with:

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

None of these answers worked for me so I will post my way to solve this. I use the following at the beginning of my main.py script and it works fine.

Use the following as it is (copy-paste it):

def warn(*args, **kwargs):
    pass
import warnings
warnings.warn = warn

or 1-liner, thanks Philippe Remy 's comment

import warnings ; warnings.warn = lambda *args,**kwargs: None

Example:

def warn(*args, **kwargs):
    pass
import warnings
warnings.warn = warn


import "blabla"
import "blabla"

# more code here...
# more code here...

I found the cleanest way to do this (especially on windows) is by adding the following to C:\Python26\Lib\site-packages\sitecustomize.py:

import warnings
warnings.filterwarnings("ignore", category=DeprecationWarning)

Note that I had to create this file. Of course, change the path to python if yours is different.

Docker Solution

• Disable ALL warnings before running the python application
  • You can disable your dockerized tests as well

ENV PYTHONWARNINGS="ignore::DeprecationWarning"

When you want to ignore warnings only in functions you can do the following.

import warnings
from functools import wraps


def ignore_warnings(f):
    @wraps(f)
    def inner(*args, **kwargs):
        with warnings.catch_warnings(record=True) as w:
            warnings.simplefilter("ignore")
            response = f(*args, **kwargs)
        return response
    return inner

@ignore_warnings
def foo(arg1, arg2):
    ...
    write your code here without warnings
    ...

@ignore_warnings
def foo2(arg1, arg2, arg3):
    ...
    write your code here without warnings
    ...

Just add the @ignore_warnings decorator on the function you want to ignore all warnings

Python 3

Just write below lines that are easy to remember before writing your code:

import warnings

warnings.filterwarnings("ignore")

If you are using logging (https://docs.python.org/3/library/logging.html) to format or redirect your ERROR, NOTICE, and DEBUG messages, you can redirect the WARNINGS from the warning system to the logging system:

logging.captureWarnings(True)

It will capture the warnings with the tag "py.warnings". Also if you want to throw away those warnings without logging, you can then, set the logging level to ERROR by using:

logging.getLogger("py.warnings").setLevel(logging.ERROR)

It will cause all those warnings to be ignored without showing up in your terminal or anywhere else.

See https://docs.python.org/3/library/warnings.html and https://docs.python.org/3/library/logging.html#logging.captureWarnings and captureWarnings set to True doesn't capture warnings

In my case, I was formatting all the exceptions with the logging system, but warnings (e.g. scikit-learn) were not affected.

Pass the correct arguments? :P

On the more serious note, you can pass the argument -Wi::DeprecationWarning on the command line to the interpreter to ignore the deprecation warnings.

Convert the argument to int. It's as simple as

int(argument)

For python 3, just write below codes to ignore all warnings.

from warnings import filterwarnings
filterwarnings("ignore")

Try the below code if you're Using Python3:

import sys

if not sys.warnoptions:
    import warnings
    warnings.simplefilter("ignore")

or try this...

import warnings

def fxn():
    warnings.warn("deprecated", DeprecationWarning)

with warnings.catch_warnings():
    warnings.simplefilter("ignore")
    fxn()

or try this...

import warnings
warnings.filterwarnings("ignore")

To add to previous solutions, if you continue to receive warnings in certain parallel applications (such as those that use multiprocessing, it is possible that the warning filters need to be passed to child processes as well. You can do that with something like this:

import sys, os

if not sys.warnoptions:
    import warnings
    warnings.simplefilter("ignore")
    
    os.environ["PYTHONWARNINGS"] = "ignore"

Adding the os.environ line will cause subprocesses to also ignore warnings.

If you know what you are doing, another way is simply find the file that warns you(the path of the file is shown in warning info), comment the lines that generate the warnings.

A bit rough, but it worked for me after the above methods did not.

./myscrypt.py 2>/dev/null