擅长:python、mysql、java
<p>可以使用正则表达式:</p>
<pre><code>import re
regex = re.compile('i', flags=re.IGNORECASE)
txt = input("Enter text: ")
# re.sub() always searches from left, so we reverse txt using slice [::-1]
# to find the last match. Then we flip it again.
txt = regex.sub('', txt[::-1], 1)
txt = regex.sub('', txt[::-1], 1)
print(txt)
</code></pre>
<p>另一种更简单的方法。你知道吗</p>
<pre><code>txt = input("Enter text: ")
for direction in 'from right', 'from left': # do it twice
txt = re.sub('[iI]', '', txt[::-1], count=1)
print(txt)
</code></pre>