python - inspect.getsource() 在 python 中不起作用

Question

我对这段代码有疑问，但不知道为什么...

import inspect
inspect.getsource(min)

错误是:

Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    inspect.getsource(min)
  File "C:\Python33\lib\inspect.py", line 726, in getsource
    lines, lnum = getsourcelines(object)
  File "C:\Python33\lib\inspect.py", line 715, in getsourcelines
    lines, lnum = findsource(object)
  File "C:\Python33\lib\inspect.py", line 551, in findsource
    file = getfile(object)
  File "C:\Python33\lib\inspect.py", line 435, in getfile
    'function, traceback, frame, or code object'.format(object))
TypeError: <built-in function min> is not a module, class, method, function, traceback, frame,or code object

Answer 1

内置的min()是用C代码实现的，inspect.getsource()只能给你看Python代码:

>>> min
<built-in function min>

内置函数 类型始终在 C 中实现。

该函数的代码来自bltinmodule.c源文件； builtin_min() function与会代表 min_max() utility function在同一个源文件中。