How Can I Silence Python Warnings Effectively?

Silencing the Chorus of Python Warnings

Would you like to bid farewell to the constant stream of warnings in your Python code? This can be especially troublesome when working with legacy code or modules that generate excessive warnings. While manually disabling warnings for individual functions might be an option, there are more elegant solutions available.

Temporarily Suppressing Warnings

Python's warnings module offers a clever way to temporarily silence warnings. By utilizing the catch_warnings context manager, one can ignore specific warning categories during a specific code block. It's as simple as wrapping your code within a with ... statement.

import warnings

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

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

Alternatively, for Python versions 3.11 and above, a more concise syntax is available:

with warnings.catch_warnings(action="ignore"):
    fxn()

Global Warning Suppression

If you're feeling a little rebellious and would rather shut down all warnings at once, the warnings.filterwarnings function provides a quick and dirty solution. Just set action to "ignore" to instantly silence the warning choir.

import warnings

warnings.filterwarnings("ignore")

def f():
    print('before')
    warnings.warn('you are warned!')
    print('after')

f()

Before:

>>> f()
before
<stdin>:3: UserWarning: you are warned!
after</stdin>

After:

>>> warnings.filterwarnings("ignore")
>>> f()
before
after

Recommendation

For most scenarios, we recommend the targeted approach of using catch_warnings to ignore specific warnings while maintaining the ability to catch essential ones. This ensures that you're not troubleshooting issues based on irrelevant warnings. However, if you're positive that you want to suppress all warnings, the warnings.filterwarnings approach can provide a global solution.

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