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Issue #28637: Revert issue #28082, don't import enum in re 

Importing the enum module in the re module slows down Python startup by 34%
when Python is run from a virtual environment, or more generally when the re
module is imported at startup but not the enum module.
This commit is contained in:
Victor Stinner 2016-11-08 00:42:46 +01:00
parent 9b88fdf4f0
commit 1ec1cd161b
1 changed files with 12 additions and 21 deletions
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29
Lib/re.py
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@ -119,7 +119,6 @@ This module also defines an exception 'error'.
"""
import enum
import sre_compile
import sre_parse
import functools
@ -139,26 +138,18 @@ __all__ = [
__version__ = "2.2.1"
class RegexFlag(enum.IntFlag):
ASCII = sre_compile.SRE_FLAG_ASCII # assume ascii "locale"
IGNORECASE = sre_compile.SRE_FLAG_IGNORECASE # ignore case
LOCALE = sre_compile.SRE_FLAG_LOCALE # assume current 8-bit locale
UNICODE = sre_compile.SRE_FLAG_UNICODE # assume unicode "locale"
MULTILINE = sre_compile.SRE_FLAG_MULTILINE # make anchors look for newline
DOTALL = sre_compile.SRE_FLAG_DOTALL # make dot match newline
VERBOSE = sre_compile.SRE_FLAG_VERBOSE # ignore whitespace and comments
A = ASCII
I = IGNORECASE
L = LOCALE
U = UNICODE
M = MULTILINE
S = DOTALL
X = VERBOSE
# flags
A = ASCII = sre_compile.SRE_FLAG_ASCII # assume ascii "locale"
I = IGNORECASE = sre_compile.SRE_FLAG_IGNORECASE # ignore case
L = LOCALE = sre_compile.SRE_FLAG_LOCALE # assume current 8-bit locale
U = UNICODE = sre_compile.SRE_FLAG_UNICODE # assume unicode "locale"
M = MULTILINE = sre_compile.SRE_FLAG_MULTILINE # make anchors look for newline
S = DOTALL = sre_compile.SRE_FLAG_DOTALL # make dot match newline
X = VERBOSE = sre_compile.SRE_FLAG_VERBOSE # ignore whitespace and comments
# sre extensions (experimental, don't rely on these)
TEMPLATE = sre_compile.SRE_FLAG_TEMPLATE # disable backtracking
T = TEMPLATE
T = TEMPLATE = sre_compile.SRE_FLAG_TEMPLATE # disable backtracking
DEBUG = sre_compile.SRE_FLAG_DEBUG # dump pattern after compilation
globals().update(RegexFlag.__members__)
# sre exception
error = sre_compile.error