install.py 文件源码

def _called_from_setup(run_frame):
        """
        Attempt to detect whether run() was called from setup() or by another
        command.  If called by setup(), the parent caller will be the
        'run_command' method in 'distutils.dist', and *its* caller will be
        the 'run_commands' method.  If called any other way, the
        immediate caller *might* be 'run_command', but it won't have been
        called by 'run_commands'. Return True in that case or if a call stack
        is unavailable. Return False otherwise.
        """
        if run_frame is None:
            msg = "Call stack not available. bdist_* commands may fail."
            warnings.warn(msg)
            if platform.python_implementation() == 'IronPython':
                msg = "For best results, pass -X:Frames to enable call stack."
                warnings.warn(msg)
            return True
        res = inspect.getouterframes(run_frame)[2]
        caller, = res[:1]
        info = inspect.getframeinfo(caller)
        caller_module = caller.f_globals.get('__name__', '')
        return (
            caller_module == 'distutils.dist'
            and info.function == 'run_commands'
        )