commands.py 文件源码

def exists(self):
        try:
            return pkg_resources.resource_exists(self.containing_package, self.relative_path.replace(os.sep, '/'))
        except ImportError as ex:
            if six.PY2 and str(ex).endswith(self.name):
                return False
            elif six.PY3 and ex.name == '.'.join([self.containing_package, self.name]):
                return False
            raise