Catching warnings pre-python 2.6

python, suppress-warnings, warnings

Solution

This is similar:

# Save the existing list of warning filters before we modify it using simplefilter().
# Note: the '[:]' causes a copy of the list to be created. Without it, original_filter
# would alias the one and only 'real' list and then we'd have nothing to restore.
original_filters = warnings.filters[:]

# Ignore warnings.
warnings.simplefilter("ignore")

try:
    # Execute the code that presumably causes the warnings.
    fxn()

finally:
    # Restore the list of warning filters.
    warnings.filters = original_filters

Edit: Without the `try/finally`, the original warning filters would not be restored if fxn() threw an exception. See PEP 343 for more discussion on how the `with` statement serves to replace `try/finally` when used like this.

Problem

In Python 2.6 it is possible to suppress warnings from the warnings module by using ``` with warnings.catch_warnings(): warnings.simplefilter("ignore") fxn() ``` Versions of Python before 2.6 don't support `with` however, so I'm wondering if there alternatives to the above that would work with pre-2.6 versions?

Original source