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bpo-31975 (PEP 565): Show DeprecationWarning in __main__ (GH-4458)

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- primary change is to add a new default filter entry for
  'default::DeprecationWarning:__main__'
- secondary change is an internal one to cope with plain
  strings in the warning module's internal filter list
  (this avoids the need to create a compiled regex object
  early on during interpreter startup)
- assorted documentation updates, including many more
  examples of configuring the warnings settings
- additional tests to ensure that both the pure Python and
  the C accelerated warnings modules have the expected
  default configuration
This commit is contained in:
Nick Coghlan 2018-01-08 12:45:02 +10:00 • committed by GitHub
parent d13889214a
commit 9b99747386
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10 changed files with 329 additions and 120 deletions
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4
Lib/warnings.py
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@ -519,8 +519,10 @@ except ImportError:
# Module initialization
_processoptions(sys.warnoptions)
if not _warnings_defaults:
# Several warning categories are ignored by default in Py_DEBUG builds
# Several warning categories are ignored by default in regular builds
if not hasattr(sys, 'gettotalrefcount'):
filterwarnings("default", category=DeprecationWarning,
module="__main__", append=1)
simplefilter("ignore", category=DeprecationWarning, append=1)
simplefilter("ignore", category=PendingDeprecationWarning, append=1)
simplefilter("ignore", category=ImportWarning, append=1)