擅长:python、mysql、java
<pre><code>def insert_string(org_string, string, pos=None):
# default position middle of org_string
if pos is None:
pos = len(org_string) / 2
return org_string[:pos] + string + org_string[pos:]
if __name__ == "__main__":
new_string = insert_string("world", "-")
print new_string
</code></pre>
<p>输出</p>
<pre><code>wo-rd
</code></pre>