python中给字符串赋值的几种方式

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# -*- coding:utf-8 -*-
s = 'abcdef'
s = list(s)
s[1] = 'E'
s = ''.join(s)
print s

s = s[0:1]+ 'E' +s[2:]
print s

s = s.replace('b','E')
print s

s = 'aEcdef'
print s