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bpo-29585: optimize site.py startup time (GH-136)

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Avoid importing `sysconfig` from `site` by copying minimum code.
Python startup is 5% faster on Linux and 30% faster on macOS
This commit is contained in:
INADA Naoki 2017-06-29 00:31:53 +09:00 • committed by GitHub
parent 79d37ae979
commit a8f8d5b4bd
8 changed files with 96 additions and 43 deletions
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26
Lib/sysconfig.py
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@ -51,6 +51,7 @@ _INSTALL_SCHEMES = {
'scripts': '{base}/Scripts',
'data': '{base}',
},
# NOTE: When modifying "purelib" scheme, update site._get_path() too.
'nt_user': {
'stdlib': '{userbase}/Python{py_version_nodot}',
'platstdlib': '{userbase}/Python{py_version_nodot}',
@ -177,32 +178,25 @@ def _get_default_scheme():
return os.name
# NOTE: site.py has copy of this function.
# Sync it when modify this function.
def _getuserbase():
env_base = os.environ.get("PYTHONUSERBASE", None)
if env_base:
return env_base
def joinuser(*args):
return os.path.expanduser(os.path.join(*args))
if os.name == "nt":
base = os.environ.get("APPDATA") or "~"
if env_base:
return env_base
else:
return joinuser(base, "Python")
return joinuser(base, "Python")
if sys.platform == "darwin":
framework = get_config_var("PYTHONFRAMEWORK")
if framework:
if env_base:
return env_base
else:
return joinuser("~", "Library", framework, "%d.%d" %
sys.version_info[:2])
if sys.platform == "darwin" and sys._framework:
return joinuser("~", "Library", sys._framework,
"%d.%d" % sys.version_info[:2])
if env_base:
return env_base
else:
return joinuser("~", ".local")
return joinuser("~", ".local")
def _parse_makefile(filename, vars=None):