master.py 文件源码

def is_stdlib_name(self, modname):
        """Return ``True`` if `modname` appears to come from the standard
        library."""
        if imp.is_builtin(modname) != 0:
            return True

        module = sys.modules.get(modname)
        if module is None:
            return False

        # six installs crap with no __file__
        modpath = getattr(module, '__file__', '')
        if 'site-packages' in modpath:
            return False

        for dirname in self.STDLIB_DIRS:
            if os.path.commonprefix((dirname, modpath)) == dirname:
                return True

        return False