擅长:python、mysql、java
<p>Python字符串是不可变的;您不能更改其内容。相反,您需要从旧字符串中生成一个新字符串,并将其分配给<code>x[0]</code>:</p>
<pre><code>x = [">000#","#0#00","00#0#"]
# change the first character to a '1'
x[0] = '1' + x[0][1:]
# add 1 to the third character
x[0] = x[0][:2] + str(int(x[0][2]) + 1) + x[0][3:]
print(x)
</code></pre>
<p>输出:</p>
<pre><code>['1010#', '#0#00', '00#0#']
</code></pre>