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bpo-41006: pkgutil imports lazily re (GH-20939)

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The pkgutil module now imports lazily the re module to speedup Python
startup time.
This commit is contained in:
Victor Stinner 2020-06-17 19:11:50 +02:00 committed by GitHub
parent 7824cc05bf
commit 98ce7b107e
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 10 additions and 4 deletions
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14
Lib/pkgutil.py
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@ -7,7 +7,6 @@
import importlib.machinery
import os
import os.path
import re
import sys
from types import ModuleType
import warnings
@ -638,9 +637,7 @@ def get_data(package, resource):
return loader.get_data(resource_name)
_DOTTED_WORDS = r'(?!\d)(\w+)(\.(?!\d)(\w+))*'
_NAME_PATTERN = re.compile(f'^(?P<pkg>{_DOTTED_WORDS})(?P<cln>:(?P<obj>{_DOTTED_WORDS})?)?$', re.U)
del _DOTTED_WORDS
_NAME_PATTERN = None
def resolve_name(name):
"""
@ -674,6 +671,15 @@ def resolve_name(name):
AttributeError - if a failure occurred when traversing the object hierarchy
within the imported package to get to the desired object)
"""
global _NAME_PATTERN
if _NAME_PATTERN is None:
# Lazy import to speedup Python startup time
import re
dotted_words = r'(?!\d)(\w+)(\.(?!\d)(\w+))*'
_NAME_PATTERN = re.compile(f'^(?P<pkg>{dotted_words})'
f'(?P<cln>:(?P<obj>{dotted_words})?)?$',
re.UNICODE)
m = _NAME_PATTERN.match(name)
if not m:
raise ValueError(f'invalid format: {name!r}')