擅长:python、mysql、java
<p>在Python中,有一个非常方便的操作可以在名为<a href="https://en.wikipedia.org/wiki/Array_slicing" rel="nofollow noreferrer">slicing</a>的字符串上完成。在</p>
<p>来自<a href="https://docs.python.org/2/tutorial/introduction.html#strings" rel="nofollow noreferrer">docs</a>的示例</p>
<pre><code>>>> word = 'Python'
>>> word[0:2] # characters from position 0 (included) to 2 (excluded)
'Py'
>>> word[2:5] # characters from position 2 (included) to 5 (excluded)
'tho'
>>> word[:2] + word[2:]
'Python'
>>> word[:4] + word[4:]
'Python'
>>> word[:2] # character from the beginning to position 2 (excluded)
'Py'
>>> word[4:] # characters from position 4 (included) to the end
'on'
>>> word[-2:] # characters from the second-last (included) to the end
'on'
</code></pre>
<p>所以你应该这样做</p>
^{pr2}$