例题 001：数字组合四个数字可以组成多少个三位数？1、2、3 和 4 四个数字互不相同且没有重复数字？各是多少？

最编程 2024-07-03 10:22:55

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class permutations(object):
"""
Return successive r-length permutations of elements in the iterable.

permutations(range(3), 2) --> (0,1), (0,2), (1,0), (1,2), (2,0), (2,1)
"""
def __getattribute__(self, *args, **kwargs): # real signature unknown
""" Return getattr(self, name). """
pass

def __init__(self, range, *args, **kwargs): # real signature unknown; NOTE: unreliably restored from __doc__
pass

def __iter__(self, *args, **kwargs): # real signature unknown
""" Implement iter(self). """
pass

@staticmethod # known case of __new__
def __new__(*args, **kwargs): # real signature unknown
""" Create and return a new object. See help(type) for accurate signature. """
pass

def __next__(self, *args, **kwargs): # real signature unknown
""" Implement next(self). """
pass

def __reduce__(self, *args, **kwargs): # real signature unknown
""" Return state information for pickling. """
pass

def __setstate__(self, *args, **kwargs): # real signature unknown
""" Set state information for unpickling. """
pass

def __sizeof__(self, *args, **kwargs): # real signature unknown
""" Returns size in memory, in bytes. """
pass

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例题 001：数字组合四个数字可以组成多少个三位数？1、2、3 和 4 四个数字互不相同且没有重复数字？各是多少？

python实战】top1 数字组合 - 有四个数字：1、2、3、4，可以组成多少个互不相同且没有重复数字的三位数？各是多少？