__init__.py 文件源码

def find_packages(where='.', exclude=()):
    """Return a list all Python packages found within directory 'where'

    'where' should be supplied as a "cross-platform" (i.e. URL-style) path; it
    will be converted to the appropriate local path syntax.  'exclude' is a
    sequence of package names to exclude; '*' can be used as a wildcard in the
    names, such that 'foo.*' will exclude all subpackages of 'foo' (but not
    'foo' itself).
    """
    out = []
    stack=[(convert_path(where), '')]
    while stack:
        where,prefix = stack.pop(0)
        for name in os.listdir(where):
            fn = os.path.join(where,name)
            looks_like_package = (
                '.' not in name
                and os.path.isdir(fn)
                and os.path.isfile(os.path.join(fn, '__init__.py'))
            )
            if looks_like_package:
                out.append(prefix+name)
                stack.append((fn, prefix+name+'.'))
    for pat in list(exclude)+['ez_setup']:
        from fnmatch import fnmatchcase
        out = [item for item in out if not fnmatchcase(item,pat)]
    return out