From a8f8d5b4bd30dbe0828550469d98f12d2ebb2ef4 Mon Sep 17 00:00:00 2001 From: INADA Naoki Date: Thu, 29 Jun 2017 00:31:53 +0900 Subject: bpo-29585: optimize site.py startup time (GH-136) Avoid importing `sysconfig` from `site` by copying minimum code. Python startup is 5% faster on Linux and 30% faster on macOS --- Lib/sysconfig.py | 26 ++++++++++---------------- 1 file changed, 10 insertions(+), 16 deletions(-) (limited to 'Lib/sysconfig.py') diff --git a/Lib/sysconfig.py b/Lib/sysconfig.py index ed0a34d662..e6618b1d51 100644 --- a/Lib/sysconfig.py +++ b/Lib/sysconfig.py @@ -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): -- cgit v1.2.1