擅长:python、mysql、java
<p>请尝试以下代码:</p>
<pre><code>def left_join(phrases):
"""
Join strings and replace "right" to "left"
"""
mlist = list(phrases)
for i in range(len(mlist)):
if mlist[i] == "right":
mlist[i] = "left"
output = ','.join(mlist)
return output
phrases = ("left", "right", "left", "stop")
output = left_join(phrases)
print(output)
</code></pre>