擅长:python、mysql、java
<p>只需在函数中使用<code>global ser</code>:</p>
<pre><code>ser = "foo"
def reset_ser():
global ser
del ser
print(ser)
reset_ser()
print(ser)
</code></pre>
<p>输出:</p>
<pre><code>foo
Traceback (most recent call last):
File "test.py", line 8, in <module>
print(ser)
NameError: name 'ser' is not defined
</code></pre>