/usr/lib/python2.7/dist-packages/transaction/tests/warnhook.py is in python-transaction 1.4.3-3.
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#
# Copyright (c) 2004 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
import warnings
class WarningsHook:
"""Hook to capture warnings generated by Python.
The function warnings.showwarning() is designed to be hooked by
application code, allowing the application to customize the way it
handles warnings.
This hook captures the unformatted warning information and stores
it in a list. A test can inspect this list after the test is over.
Issues:
The warnings module has lots of delicate internal state. If
a warning has been reported once, it won't be reported again. It
may be necessary to extend this class with a mechanism for
modifying the internal state so that we can be guaranteed a
warning will be reported.
If Python is run with a warnings filter, e.g. python -Werror,
then a test that is trying to inspect a particular warning will
fail. Perhaps this class can be extended to install more-specific
filters the test to work anyway.
"""
def __init__(self):
self.original = None
self.warnings = []
def install(self):
self.original = warnings.showwarning
warnings.showwarning = self.showwarning
def uninstall(self):
assert self.original is not None
warnings.showwarning = self.original
self.original = None
def showwarning(self, message, category, filename, lineno):
self.warnings.append((str(message), category, filename, lineno))
def clear(self):
self.warnings = []
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