如題，如何查看python內(nèi)置函數(shù)的源碼

舉個(gè)例子：

# 該以什么樣的方式，才能去看xrang的官方源碼實(shí)現(xiàn)

for i in xrange(10):

print i

# 直接點(diǎn)進(jìn)去的話，大多都是一些定義的方法名，而沒有具體實(shí)現(xiàn)

# 就是想知道，如何去看具體實(shí)現(xiàn)，而不是下面那一堆 pass

class xrange(object):

"""

xrange(stop) -> xrange object

xrange(start, stop[, step]) -> xrange object

Like range(), but instead of returning a list, returns an object that

generates the numbers in the range on demand. For looping, this is

slightly faster than range() and more memory efficient.

"""

def __getattribute__(self, name): # real signature unknown; restored from __doc__

""" x.__getattribute__('name') <==> x.name """

pass

def __getitem__(self, y): # real signature unknown; restored from __doc__

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

pass

def __init__(self, stop): # real signature unknown; restored from __doc__

pass

def __iter__(self): # real signature unknown; restored from __doc__

""" x.__iter__() <==> iter(x) """

pass

def __len__(self): # real signature unknown; restored from __doc__

""" x.__len__() <==> len(x) """

pass

@staticmethod # known case of __new__

def __new__(S, *more): # real signature unknown; restored from __doc__

""" T.__new__(S, ...) -> a new object with type S, a subtype of T """

pass

def __reduce__(self, *args, **kwargs): # real signature unknown

pass

def __repr__(self): # real signature unknown; restored from __doc__

""" x.__repr__() <==> repr(x) """

pass

def __reversed__(self, *args, **kwargs): # real signature unknown

""" Returns a reverse iterator. """

pass

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