擅长:python、mysql、java
<p>可以向函数中添加参数</p>
<pre><code>FIRST_TIME = True
NOT_FIRST_TIME = False
def factorial(i, is_first_time):
if is_first_time:
print('Ready?')
if i:
print(i)
return (factorial(i-1, NOT_FIRST_TIME))
print('Go!')
factorial(5, FIRST_TIME)
</code></pre>