这是我的代码,除了def advance(stringlist)之外,其他一切都正常工作
def printList(stringlist):
print stringlist or []
def add (stringlist, string):
item = [] if string is None else [string]
return item + (stringlist or [])
def current (stringlist):
item =''
return item + stringlist[0]
def advance(stringlist):
item = []
item2 = item + stringlist[1:]
for item in range(5):
return item2
我在寻找结果
>>> myList = None
>>> printList(myList)
[]
>>> for word in ['laundry','homework','cooking','cleaning']:
... myList = add(myList, word)
... printList(myList)
...
[laundry]
[homework, laundry]
[cooking, homework, laundry]
[cleaning, cooking, homework, laundry]
>>> current(myList)
'cleaning'
>>> for i in range(5):
... myList = advance(myList)
... printList(myList)
... print current(myList)
...
[cooking, homework, laundry, cleaning]
cooking
[homework, laundry, cleaning, cooking]
homework
[laundry, cleaning, cooking, homework]
laundry
[cleaning, cooking, homework, laundry]
cleaning
[cooking
但我现在
['cooking', 'homework', 'laundry']
cooking
['homework', 'laundry']
homework
['laundry']
laundry
[]
其他代码工作正常,只是在'前进'代码 如何使列表变成四个单词而不删除其中的任何字符串?你知道吗
您正在寻找一个列表旋转;这是用一些列表切片最容易实现的:
这将获取列表的第一个元素并将其放置在新列表的末尾:
您的版本只返回just
stringlist[1:]
(因此除了第一个元素以外的所有元素);一个return
语句在那里结束函数,然后,当它放在循环中时不会返回多次。你知道吗相关问题 更多 >
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