easy_install.py 文件源码

def get_site_dirs():
    # return a list of 'site' dirs
    sitedirs = [_f for _f in os.environ.get('PYTHONPATH',
                                            '').split(os.pathsep) if _f]
    prefixes = [sys.prefix]
    if sys.exec_prefix != sys.prefix:
        prefixes.append(sys.exec_prefix)
    for prefix in prefixes:
        if prefix:
            if sys.platform in ('os2emx', 'riscos'):
                sitedirs.append(os.path.join(prefix, "Lib", "site-packages"))
            elif os.sep == '/':
                sitedirs.extend([os.path.join(prefix,
                                              "lib",
                                              "python" + sys.version[:3],
                                              "site-packages"),
                                 os.path.join(prefix, "lib", "site-python")])
            else:
                sitedirs.extend(
                    [prefix, os.path.join(prefix, "lib", "site-packages")]
                )
            if sys.platform == 'darwin':
                # for framework builds *only* we add the standard Apple
                # locations. Currently only per-user, but /Library and
                # /Network/Library could be added too
                if 'Python.framework' in prefix:
                    home = os.environ.get('HOME')
                    if home:
                        sitedirs.append(
                            os.path.join(home,
                                         'Library',
                                         'Python',
                                         sys.version[:3],
                                         'site-packages'))
    lib_paths = get_path('purelib'), get_path('platlib')
    for site_lib in lib_paths:
        if site_lib not in sitedirs:
            sitedirs.append(site_lib)

    if site.ENABLE_USER_SITE:
        sitedirs.append(site.USER_SITE)

    sitedirs = list(map(normalize_path, sitedirs))

    return sitedirs