Is it possible to change a function’s default parameters in Python?

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Just use functools.partial

 multiplyNumbers = functools.partial(multiplyNumbers, y = 42)

One problem here: you will not be able to call it as multiplyNumbers(5, 7, 9); you should manually say y=7

If you need to remove default arguments I see two ways:

  1. Store original function somewhere

    oldF = f
f = functools.partial(f, y = 42)
//work with changed f
f = oldF //restore

  2. use partial.func

    f = f.func //go to previous version.

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