Question

I have two definitions say,

file x.py:

class x:

    def p(self, a, b) :
        # ...

file y.py:

class y:

    def p(self, a, b, c) :
        # [...]

Now I am calling these functions from another file. Command line inputs having the file names (in this case x and y) are passed in cust variable.

file z.py:

from x import  *
from y import  *

class z:

    cust.p(a, b, c)

x (or y) is being passed as the command line inputs to file z.py.
cust is the class variable of class z.

Now when cust = x object I get an error: takes exactly 2 arguments (3 given).

But when cust = y object it works fine.

How do i eliminate this error?

I do not want to modify the function definition in x.py and y.py files as there are many files.

How do i modify the code so that both the functions are called from the same function call without modifying the function definition?

Answer 1

Monkeypatch.

x.p = lambda self, a, b, c=None: x.p(self, a, b)