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恢复性宇宙功能清单
原标题:Returning a list in this recursive coi function in python

我很麻烦地把我的名单列入我的法典。 这份名单没有归还,而是没有返回,但如果我用利夫声明中的印本来取代返回,则该清单只印制了罚款。 我怎么能够修复?

def makeChange2(amount, coinDenomination, listofcoins = None):
#makes a list of coins from an amount given by using a greedy algorithm
    coinDenomination.sort()
    #reverse the list to make the largest position 0 at all times
    coinDenomination.reverse()
    #assigns list
    if listofcoins is None:
        listofcoins = []
    if amount >= coinDenomination[0]:
        listofcoins = listofcoins + [coinDenomination[0]]
        makeChange2((amount - coinDenomination[0]), coinDenomination, listofcoins)
    elif amount == 0:
        return listofcoins
    else:

        makeChange2(amount, coinDenomination[1:], listofcoins)
问题回答

页: 1

一旦控制达到<代码>makeChange2,并填写了电话,则该方案继续维持下一份声明,即该功能的结束;从而退回<代码>None。

如果这个概念仍然给你造成麻烦,则尝试使用这个简单的因素方案,同时不使用<代码>return/code>。 <代码>return n* Factorial(n-1)行文中的关键词:

def factorial(n):
   if n == 0 or n == 1:
       return 1
   return n * factorial(n-1)

print factorial(3)

通过守则进行人工操作,应有助于阐明你最初方案中的错误。





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