def rev(s): return s[::-1]
def rev(s):
str0 = ''
l = len(s)-1
while l >= 0:
str0 += s[l]
l -= 1
return str0
def rev(s): a = list(s) a.reverse() return ''.join(a)
>>> a=['a','c','b','d'] >>> b=['a','c','b','d'] >>> a.sort(reverse=True) >>> b.reverse() >>> a ['d', 'c', 'b', 'a'] >>> b ['d', 'b', 'c', 'a']
def rev(s): return reduce(lambda x, y : y + x, s)
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