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javascript - 如何Python双阶乘
Jun 06, 2016 pm 08:24 PM
javascript
php
python
5! = 5*4*3*2*1 = 120; print reduce(lambda x,y:x*y,range(1,6))#120 5!! = 5*3*1 = 15; //这个怎么处理?
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回复内容:
5! = 5*4*3*2*1 = 120; print reduce(lambda x,y:x*y,range(1,6))#120 5!! = 5*3*1 = 15; //这个怎么处理?
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import operator reduce(operator.mul,range(5,0,-2))
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或者 你如你坚持自己写乘法,
reduce(lambda x,y:x*y,range(5,0,-2))
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另外 如果你不想import
reduce(int.__mul__,range(5,0,-2))
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不知道双阶乘的意思 不过你看这个能用吗
reduce(lambda x,y:x*y,range(1,6, 2))
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