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Question

这是我试图反转这些字符串的代码

presidents = [ "George Washington " , " John Adams " , " Thomas Jefferson " , " James Madison " , " James Monroe " ," John Quincy Adams " ]

reversedPresidents=""
for ch in presidents:
    reversedPresidents=ch+reversedPresidents

print(reversedPresidents)

截至目前，它只会向后打印列表：

John Quincy Adams  James Monroe  James Madison  Thomas Jefferson  John Adams George Washington 

我需要输出列表，如：

notgnihsaW egroeG
smadA nhoJ

等等

Answer 1

试试这个：

>>> reversedPresidents = [p[::-1] for p in presidents]
>>> print(reversedPresidents)
[' notgnihsaW egroeG', ' smadA nhoJ ', ' nosreffeJ samohT ', ' nosidaM semaJ ', ' eornoM semaJ ', ' smadA ycniuQ nhoJ ']
>>> 

Answer 2

递归之美：

presidents = [ "George Washington " , " John Adams " , " Thomas Jefferson " , " James Madison " , " James Monroe " ," John Quincy Adams " ]

def reverse_list(list_1):
    for item in list_1:
        def reverse(word):
            if len(word)==0:
                return word
            else:
                return reverse(word[1:]) + word[0]
        print(reverse(item))
print(reverse_list(presidents))

输出：

 notgnihsaW egroeG
 smadA nhoJ 
 nosreffeJ samohT 
 nosidaM semaJ 
 eornoM semaJ 
 smadA ycniuQ nhoJ 

Answer 3

你也可以试试这个：

>>> presidents = [ "George Washington " , " John Adams " , " Thomas Jefferson " , " James Madison " , " James Monroe " ," John Quincy Adams " ]

>>>> print(["".join(reversed(x)) for x in presidents])
[' notgnihsaW egroeG', ' smadA nhoJ ', ' nosreffeJ samohT ', ' nosidaM semaJ ', ' eornoM semaJ ', ' smadA ycniuQ nhoJ ']

Answer 4

试试这个：

presidents = [ "George Washington " , " John Adams " , " Thomas Jefferson " , 
" James Madison " , " James Monroe " ," John Quincy Adams " ]

reversedPresidents=[]
for ch in presidents: 
     reversedPresidents.append(ch[::-1])

print(reversedPresidents)

 [' notgnihsaW egroeG', ' smadA nhoJ ', ' nosreffeJ samohT ', ' nosidaM 
  semaJ ', ' eornoM semaJ ', ' smadA ycniuQ nhoJ ']