Как отключить предупреждения питон

How to disable Python warnings?

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?

@MartinSamson I generally agree, but there are legitimate cases for ignoring warnings. I get several of these from using the valid Xpath syntax in defusedxml: FutureWarning: This search is broken in 1.3 and earlier, and will be fixed in a future version. If you rely on the current behaviour, change it to [this other thing] . I would rather ignore the warnings now and wait for it to be silently fixed than write needlessly ugly code just to avoid a harmless warning.

«Python doesn’t throw around warnings for no reason.» But some developers do. I am using a module that throws a useless warning despite my completely valid usage of it.

13 Answers 13

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("deprecated", DeprecationWarning) with warnings.catch_warnings(): warnings.simplefilter("ignore") fxn() 

I don’t condone it, but you could just suppress all warnings with this:

import warnings warnings.filterwarnings("ignore") 

>>> import warnings >>> def f(): . print('before') . warnings.warn('you are warned!') . print('after') . >>> f() before :3: UserWarning: you are warned! after >>> warnings.filterwarnings("ignore") >>> f() before after 

@Framester — yes, IMO this is the cleanest way to suppress specific warnings, warnings are there in general because something could be wrong, so suppressing all warnings via the command line might not be the best bet.

@Framester — I listed the other option with an example as well. I don’t like it as much (for reason I gave in the previous comment) but at least now you have the tools.

If you only expect to catch warnings from a specific category, you can pass it using the category argument: warnings.filterwarnings(«ignore», category=DeprecationWarning)

This is useful for me in this case because html5lib spits out lxml warnings even though it is not parsing xml. Thanks

There is also a useful parameter for the warnings.filterwarnings function: module . It allows you to ignore warnings from specified module.

To ignore only specific message you can add details in parameter. man python describes it in details excepts module name specification. I spent much time guessing it. Finally i got this command python3 -W ignore::UserWarning:git.cmd:914 ./test.py for warning /usr/local/lib/python3.4/dist-packages/git/cmd.py:914: UserWarning: Python 3.5 support is deprecated.

You can also define an environment variable (new feature in 2010 — i.e. python 2.7)

export PYTHONWARNINGS="ignore" 

$ export PYTHONWARNINGS="default" $ python >>> import warnings >>> warnings.warn('my warning') __main__:1: UserWarning: my warning >>> 

$ export PYTHONWARNINGS="ignore" $ python >>> import warnings >>> warnings.warn('my warning') >>> 

For deprecation warnings have a look at how-to-ignore-deprecation-warnings-in-python

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.)

import warnings with warnings.catch_warnings(): warnings.filterwarnings("ignore", category=DeprecationWarning) import md5, sha yourcode() 

Now you still get all the other DeprecationWarning s, but not the ones caused by:

This is especially useful to ignore warnings when performing tests. Using tox , adding PYTHONWARNINGS=ignore to setenv makes output less dirty.

since I am loading environment variables for other purposes in my .env file I added the line PYTHONWARNINGS=ignore and it worked like a charm (works for python 3.10)

Not to make it complicated, just use these two lines

import warnings warnings.filterwarnings('ignore') 

If you don’t want something complicated, then:

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

And to turn things back to the default behavior: warnings.filterwarnings(«default», category=FutureWarning)

then add to the top of your code:

import shutup; shutup.please() 

Disclaimer: I am the owner of that repository. I wrote it after the 5th time I needed this and couldn’t find anything simple that just worked.

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 .

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") 

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

Change ignore to default when working on the file or adding new functionality to re-enable warnings.

I realise this is only applicable to a niche of the situations, but within a numpy context I really like using np.errstate :

__main__:1: RuntimeWarning: invalid value encountered in sqrt nan 

with np.errstate(invalid='ignore'): np.sqrt(-1) 

The best part being you can apply this to very specific lines of code only.

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. 

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. 

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Подавить предупреждения в Python

1. Используйте функцию filterwarnings() для подавления предупреждений в Python
2. Используйте параметр -Wignore для подавления предупреждений в Python
3. Используйте переменную среды PYTHONWARNINGS для подавления предупреждений в Python

Предупреждения в Python возникают при использовании устаревшего класса, функции, ключевого слова и т. Д. Это не похоже на ошибки. Когда в программе возникает ошибка, программа завершается. Но, если в программе есть предупреждения, она продолжает работать.

В этом руководстве показано, как подавить предупреждения в программах на Python.

Используйте функцию filterwarnings() для подавления предупреждений в Python

Модуль warnings обрабатывает предупреждения в Python. Мы можем отображать предупреждения, созданные пользователем, с помощью функции warn (). Мы можем использовать функцию filterwarnings() для выполнения действий с конкретными предупреждениями.

import warnings warnings.filterwarnings('ignore', '.*do not.*', ) warnings.warn('DelftStack') warnings.warn('Do not show this message') 

string>:3: UserWarning: DelftStack 

Как видно, действие ignore в фильтре срабатывает, когда возникает предупреждение Do not show this message warning , и отображается только предупреждение DelftStack .

Мы можем подавить все предупреждения, просто используя действие ignore .

import warnings warnings.filterwarnings('ignore') warnings.warn('DelftStack') warnings.warn('Do not show this message') print("No Warning Shown") 

Используйте параметр -Wignore для подавления предупреждений в Python

Параметр -W позволяет контролировать, нужно ли выводить предупреждение. Но этой опции нужно придавать определенную ценность. Необязательно указывать только одно значение. Мы можем предложить более одного значения опции, но опция -W будет учитывать последнее значение.

Для полного подавления предупреждений используется опция -Wignore . Мы должны использовать это в командной строке при запуске файла, как показано ниже.

python -W warningsexample.py 

Используйте переменную среды PYTHONWARNINGS для подавления предупреждений в Python

Мы можем экспортировать новую переменную среды в Python 2.7 и выше. Мы можем экспортировать PYTHONWARNINGS и настроить его на игнорирование, чтобы подавить предупреждения, возникающие в программе Python.

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