Python 2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import inspect

>>> inspect.getargspec(list.__dict__["__getitem__"])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Program Files\Python25\lib\inspect.py", line 743, in getargspec
    raise TypeError('arg is not a Python function')
TypeError: arg is not a Python function

>>> inspect.getargspec(list.remove)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Program Files\Python25\lib\inspect.py", line 743, in getargspec
    raise TypeError('arg is not a Python function')
TypeError: arg is not a Python function
>>> list.remove
<method 'remove' of 'list' objects>

>>> inspect.getargspec(len)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Program Files\Python25\lib\inspect.py", line 743, in getargspec
    raise TypeError('arg is not a Python function')
TypeError: arg is not a Python function
>>> type(len)
<type 'builtin_function_or_method'>

>>> def mymethod(x):
...     print x
...
>>> inspect.getargspec(mymethod)
(['x'], None, None, None)
>>> type(mymethod)
<type 'function'>

>>> class MyClass:
...     def my_method(self, x):
...             print x
...
>>> inspect.getargspec(MyClass.my_method)
(['self', 'x'], None, None, None)
>>> MyClass.my_method
<unbound method MyClass.my_method>
>>> m = MyClass()
>>> inspect.getargspec(m.my_method)
(['self', 'x'], None, None, None)
>>> m.my_method
<bound method MyClass.my_method of <__main__.MyClass instance at 0x00C20350>>
>>>

>>> help(list.__getitem__)
Help on method_descriptor:

__getitem__(...)
    x.__getitem__(y) <==> x[y]

>>> help(list.remove)
Help on method_descriptor:

remove(...)
    L.remove(value) -- remove first occurrence of value

>>> help(len)
Help on built-in function len in module __builtin__:

len(...)
    len(object) -> integer

    Return the number of items of a sequence or mapping.

>>>