It seems feasible to have a feature that automates the task of generating a skeleton init routine for a new class.
One approach would be to write
Class C(object):
__init__(self, a, b, c, ...):
then hit a key or invoke a menu function that adds the code
self.a = a
self.b = b
self.c = c
...
The programmer could then modify the generated code to deal with computations around the initial parameters.
I recognize that there are introspective approaches that achieve a similar effect at runtime, but this deprives the IDE of the ability to prompt on class member names while entering other code.