Signature-based Function Overloading in Python

[Michael Rudolf]

Just a quick question about what would be the most pythonic approach in 
this.

In Java, Method Overloading is my best friend, but this won't work in 
Python:

>>> def a():
        pass
>>> def a(x):
        pass
>>> a()
Traceback (most recent call last):
  File "<pyshell#12>", line 1, in <module>
    a()
TypeError: a() takes exactly 1 argument (0 given)

So - What would be the most pythonic way to emulate this?
Is there any better Idom than:

>>> def a(x=None):
        if x is None:
                pass
        else:
                pass

?

Thanks,
Michael
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