__init__.py 文件源码

def get_language(language_code):
    for tag in normalize_language_tag(language_code):
        tag = tag.replace('-','_') # '-' not valid in module names
        if tag in _languages:
            return _languages[tag]
        try:
            module = __import__(tag, globals(), locals(), level=1)
        except ImportError:
            try:
                module = __import__(tag, globals(), locals(), level=0)
            except ImportError:
                continue
        _languages[tag] = module
        return module
    return None