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Python

"""
A module that implements tooling to enable easy warnings about deprecations.
"""
import logging
import warnings
from typing import Any, Optional, TextIO, Type, Union
from pip._vendor.packaging.version import parse
from pip import __version__ as current_version
DEPRECATION_MSG_PREFIX = "DEPRECATION: "
class PipDeprecationWarning(Warning):
pass
_original_showwarning = None # type: Any
# Warnings <-> Logging Integration
def _showwarning(
message, # type: Union[Warning, str]
category, # type: Type[Warning]
filename, # type: str
lineno, # type: int
file=None, # type: Optional[TextIO]
line=None, # type: Optional[str]
):
# type: (...) -> None
if file is not None:
if _original_showwarning is not None:
_original_showwarning(message, category, filename, lineno, file, line)
elif issubclass(category, PipDeprecationWarning):
# We use a specially named logger which will handle all of the
# deprecation messages for pip.
logger = logging.getLogger("pip._internal.deprecations")
logger.warning(message)
else:
_original_showwarning(message, category, filename, lineno, file, line)
def install_warning_logger():
# type: () -> None
# Enable our Deprecation Warnings
warnings.simplefilter("default", PipDeprecationWarning, append=True)
global _original_showwarning
if _original_showwarning is None:
_original_showwarning = warnings.showwarning
warnings.showwarning = _showwarning
def deprecated(reason, replacement, gone_in, issue=None):
# type: (str, Optional[str], Optional[str], Optional[int]) -> None
"""Helper to deprecate existing functionality.
reason:
Textual reason shown to the user about why this functionality has
been deprecated.
replacement:
Textual suggestion shown to the user about what alternative
functionality they can use.
gone_in:
The version of pip does this functionality should get removed in.
Raises errors if pip's current version is greater than or equal to
this.
issue:
Issue number on the tracker that would serve as a useful place for
users to find related discussion and provide feedback.
Always pass replacement, gone_in and issue as keyword arguments for clarity
at the call site.
"""
# Construct a nice message.
# This is eagerly formatted as we want it to get logged as if someone
# typed this entire message out.
sentences = [
(reason, DEPRECATION_MSG_PREFIX + "{}"),
(gone_in, "pip {} will remove support for this functionality."),
(replacement, "A possible replacement is {}."),
(
issue,
(
"You can find discussion regarding this at "
"https://github.com/pypa/pip/issues/{}."
),
),
]
message = " ".join(
template.format(val) for val, template in sentences if val is not None
)
# Raise as an error if it has to be removed.
if gone_in is not None and parse(current_version) >= parse(gone_in):
raise PipDeprecationWarning(message)
warnings.warn(message, category=PipDeprecationWarning, stacklevel=2)