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Python (3) has keyword only parameters


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>>> def foo(a,b,*,c,d):
...     print(a,b,c,d)
...
>>> foo(1,2,3,4)
Traceback (most recent call last):
File "", line 1, in
TypeError: foo() takes exactly 2 positional arguments (4 given)
In this case, everything after the * is required to be keyword only. This means that you can safely amend the function definition to re-order or even add keyword arguments.
Likewise, the following requires ALL keyword arguments.
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>>> def foo(*,a,b):
...     print(a,b)
...
>>> foo(1,2)
Traceback (most recent call last):
  File "", line 1, in
TypeError: foo() takes exactly 0 positional arguments (2 given)
 
>>> foo(a=1, b=2)
1 2

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