Methods should use *args and **kwargs

[fjcmontenegro]

Methods in which the amount of arguments passed needs to be checked in order to decide its behavior (e.g. polar()) should use *args and **kwargs instead of checking only the first argument. Checking if the first argument is there assumes unnamed arguments only, forgetting about named arguments.

For example:

def f(a=0, b=0):
    if not a:
        print("No arguments")
    else: 
        print("Arguments")

f(b=10)
>>> No arguments # THIS IS WRONG! Clearly an argument was given