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"""
A module that implements tooling to enable easy warnings about deprecations.
"""
from __future__ import absolute_import
import logging
import warnings
class PipDeprecationWarning(Warning):
pass
class Pending(object):
pass
class RemovedInPip10Warning(PipDeprecationWarning):
pass
class RemovedInPip11Warning(PipDeprecationWarning, Pending):
pass
class Python26DeprecationWarning(PipDeprecationWarning):
pass
# Warnings <-> Logging Integration
_warnings_showwarning = None
def _showwarning(message, category, filename, lineno, file=None, line=None):
if file is not None:
if _warnings_showwarning is not None:
_warnings_showwarning(
message, category, filename, lineno, file, line,
)
else:
if issubclass(category, PipDeprecationWarning):
# We use a specially named logger which will handle all of the
# deprecation messages for pip.
logger = logging.getLogger("pip.deprecations")
# This is purposely using the % formatter here instead of letting
# the logging module handle the interpolation. This is because we
# want it to appear as if someone typed this entire message out.
log_message = "DEPRECATION: %s" % message
# PipDeprecationWarnings that are Pending still have at least 2
# versions to go until they are removed so they can just be
# warnings. Otherwise, they will be removed in the very next
# version of pip. We want these to be more obvious so we use the
# ERROR logging level.
if issubclass(category, Pending):
logger.warning(log_message)
else:
logger.error(log_message)
else:
_warnings_showwarning(
message, category, filename, lineno, file, line,
)
def install_warning_logger():
# Enable our Deprecation Warnings
warnings.simplefilter("default", PipDeprecationWarning, append=True)
global _warnings_showwarning
if _warnings_showwarning is None:
_warnings_showwarning = warnings.showwarning
warnings.showwarning = _showwarning