Write a Python program that will perform various calculations
(addition, subtraction, multiplication, division, and average).
The program will add, subtract, multiply, or divide 2 numbers
and provide the average of multiple numbers inputted from the
user.
You need to define a function named performCalculation which
takes 1 parameter. The parameter will be the operation being
performed (+,-,*,/). This function will perform the given prompt
from the user for 2 numbers then perform the expected operation
depending on the parameter that’s...