Simple Function Overloading with Decorator (Python)

2010-04-06T00:59:52-07:00

Python recipe 577064 by Ryan Lie (decorator, function, overloading, python). Revision 3.

The recipe presents a simple decorator for function overloading in python. The @overloaded function searches for the first overloads that doesn't raise TypeError when called. Overloads are added to the overloads list by using the @func.overload_with decorator. The order of function definition determines which function gets tried first and once it founds a compatible function, it skips the rest of the overloads list.

Type-Checking Function Overloading Decorator (Python)

2010-04-11T11:16:48-07:00

Python recipe 577065 by Ryan Lie (checkng, decorator, function, overloading, python, type). Revision 2.

The recipe presents a function overloading decorator in python that do type check. The type signature is marked with the @takes and @returns decorator, which causes the function to raise an InputParameterError exception if called with inappropriate arguments. The @overloaded function searches for the first overloads that doesn't raise TypeError or InputParameterError when called. Alternative overloads are added to the overloads list by using the @func.overload_with decorator. The order of function definition determines which function gets tried first and once it founds a compatible function, it skips the rest of the overloads list.

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