擅长:python、mysql、java
<p>而不是..:</p>
<pre><code>class ConcreteB(BaseClass):
def example(self, param1, param2):
""" (docstring) """
# [...] (user code)
return False
</code></pre>
<p>。。。用途:</p>
<pre><code>class ConcreteB(BaseClass):
def example(self, param1, param2, param3=None):
""" (docstring) """
if param3 is not None:
raise TypeError('Illegal call')
# [...] (user code)
return False
</code></pre>