def aaa(oldstr):
newlist = []
for i in range(len(oldstr)-1,-1,-1):
print(i)
newlist.append(oldstr[i])
print(''.join(newlist))
aaa('abcdefghijk')
print('abcdefghijk'[::-1])
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转载自www.cnblogs.com/xiaojinniu425/p/9225512.html
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