reverse a string, python code:
class Solution:
def rev1(self, string1):
k1=list(string1)
print(k1)
for i in range(int(len(k1)/2)):
k1[i],k1[len(k1)-1-i]=k1[len(k1)-1-i],k1[i]
k2=''.join(k1)
return(k2)
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