带有内置函数的 Python inspect.getargspec [英] Python inspect.getargspec with built-in function

问题描述

我试图找出从模块中检索到的方法的参数.我发现了一个带有方便函数 getargspec 的 inspect 模块.它适用于我定义的函数，但不适用于来自导入模块的函数.

I'm trying to figure out the arguments of a method retrieved from a module. I found an inspect module with a handy function, getargspec. It works for a function that I define, but won't work for functions from an imported module.

import math, inspect
def foobar(a,b=11): pass
inspect.getargspec(foobar)  # this works
inspect.getargspec(math.sin) # this doesn't

我会收到这样的错误:

   File "C:\...\Python 2.5\Lib\inspect.py", line 743, in getargspec
     raise TypeError('arg is not a Python function')
 TypeError: arg is not a Python function

inspect.getargspec 是专为本地函数设计的还是我做错了什么?

Is inspect.getargspec designed only for local functions or am I doing something wrong?

推荐答案

对于用 C 而不是 Python 实现的函数，不可能获得此类信息.

It is impossible to get this kind of information for a function that is implemented in C instead of Python.

这样做的原因是，除了解析(自由格式)文档字符串之外，无法找出该方法接受的参数，因为参数是以(有点)类似 getarg 的方式传递的——即不可能找到在不实际执行函数的情况下找出它接受的参数.

The reason for this is that there is no way to find out what arguments the method accepts except by parsing the (free-form) docstring since arguments are passed in a (somewhat) getarg-like way - i.e. it's impossible to find out what arguments it accepts without actually executing the function.

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