擅长:python、mysql、java
<p>看起来很直截了当</p>
<pre><code>>>> class letter_generator:
... def __init__(self, prefix, places):
... self.prefix = prefix
... self.places = places
... current = 0
... def get_unique_id(self):
... self.current+=1
... return "%s%s" % (self.prefix, str(self.current).zfill(self.places))
...
>>>
>>> l = letter_generator('TM',5)
>>> l.get_unique_id()
'TM00001'
>>> l.get_unique_id()
'TM00002'
>>> l.get_unique_id()
'TM00003'
>>> l.get_unique_id()
'TM00004'
>>>
</code></pre>