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GH-77621: Delay some imports from pathlib (#112244)
Import `contextlib`, `glob` and `re` only as required. Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
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@ -5,14 +5,11 @@
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operating systems.
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"""
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import contextlib
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import functools
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import glob
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import io
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import ntpath
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import os
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import posixpath
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import re
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import sys
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import warnings
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from _collections_abc import Sequence
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@ -75,17 +72,23 @@ def _is_case_sensitive(pathmod):
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# Globbing helpers
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#
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re = glob = None
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@functools.lru_cache(maxsize=256)
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def _compile_pattern(pat, sep, case_sensitive):
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"""Compile given glob pattern to a re.Pattern object (observing case
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sensitivity)."""
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global re, glob
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if re is None:
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import re, glob
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flags = re.NOFLAG if case_sensitive else re.IGNORECASE
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regex = glob.translate(pat, recursive=True, include_hidden=True, seps=sep)
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# The string representation of an empty path is a single dot ('.'). Empty
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# paths shouldn't match wildcards, so we consume it with an atomic group.
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regex = r'(\.\Z)?+' + regex
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return re.compile(regex, flags).match
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return re.compile(regex, flags=flags).match
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def _select_children(parent_paths, dir_only, follow_symlinks, match):
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@ -981,7 +984,8 @@ def iterdir(self):
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def _scandir(self):
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# Emulate os.scandir(), which returns an object that can be used as a
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# context manager. This method is called by walk() and glob().
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return contextlib.nullcontext(self.iterdir())
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from contextlib import nullcontext
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return nullcontext(self.iterdir())
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def _make_child_relpath(self, name):
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path_str = str(self)
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@ -0,0 +1,2 @@
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Slightly improve the import time of the :mod:`pathlib` module by deferring
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some imports. Patch by Barney Gale.
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