<p>例如:</p>
<pre><code>string1 = 'ABC'
string2 = 'xBz'
for a, b in string1, string2:
if a == b:
print 'True'
a = (a.upper())
b = (b.upper())
else:
print 'False'
a = (a.upper())
b = (b.upper())
print 'new string1 =', string1
print 'new string2 =', string2
</code></pre>
<p>我希望能够逐个字符比较字符串,然后根据它们是否相同来修改字符。我尝试过使用zip(),但结果是元组无法修改(如果我理解正确的话)</p>