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Copy path__init__.py
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72 lines (62 loc) · 2.6 KB
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from __future__ import (absolute_import, division, print_function,
unicode_literals)
import warnings
from contextlib import contextmanager
from matplotlib.cbook import is_string_like, iterable
def _is_list_like(obj):
"""Returns whether the obj is iterable and not a string"""
return not is_string_like(obj) and iterable(obj)
# stolen from pandas
@contextmanager
def assert_produces_warning(expected_warning=Warning, filter_level="always",
clear=None):
"""
Context manager for running code that expects to raise (or not raise)
warnings. Checks that code raises the expected warning and only the
expected warning. Pass ``False`` or ``None`` to check that it does *not*
raise a warning. Defaults to ``exception.Warning``, baseclass of all
Warnings. (basically a wrapper around ``warnings.catch_warnings``).
>>> import warnings
>>> with assert_produces_warning():
... warnings.warn(UserWarning())
...
>>> with assert_produces_warning(False):
... warnings.warn(RuntimeWarning())
...
Traceback (most recent call last):
...
AssertionError: Caused unexpected warning(s): ['RuntimeWarning'].
>>> with assert_produces_warning(UserWarning):
... warnings.warn(RuntimeWarning())
Traceback (most recent call last):
...
AssertionError: Did not see expected warning of class 'UserWarning'.
..warn:: This is *not* thread-safe.
"""
with warnings.catch_warnings(record=True) as w:
if clear is not None:
# make sure that we are clearning these warnings
# if they have happened before
# to guarantee that we will catch them
if not _is_list_like(clear):
clear = [clear]
for m in clear:
try:
m.__warningregistry__.clear()
except:
pass
saw_warning = False
warnings.simplefilter(filter_level)
yield w
extra_warnings = []
for actual_warning in w:
if (expected_warning and issubclass(actual_warning.category,
expected_warning)):
saw_warning = True
else:
extra_warnings.append(actual_warning.category.__name__)
if expected_warning:
assert saw_warning, ("Did not see expected warning of class %r."
% expected_warning.__name__)
assert not extra_warnings, ("Caused unexpected warning(s): %r."
% extra_warnings)