How to use switch/case in python?

[buran]

Do you understand that the values in the dictionary are functions?

actually in the current implementation they call/execute all functions in the dict at the time when it is defined i.e. at the moment it's a dict of calculated results using global variables, not functions. And that is bad

Also functions should take operands as arguments (like in OP original code), not use global variables.

---

def add (a, b):
    return a + b

def substract(a, b):
    return a - b

math_functions = {'1':add, '2':substract}

user_func = input('What math operation (1 for add, 2 for substract): ')
num1 = int(input('Enter first integer number: '))
num2 = int(input('Enter second integer number: '))
print(math_functions[user_func](num1, num2))

Output:
What math operation (1 for add, 2 for substract): 1
Enter first integer number: 10
Enter second integer number: 3
13

the code is bare-bone, i.e. no checks for invalid input, etc. Also as ndc85430 wrote - one can use operator module from standard library

Also check our tutorial: https://python-forum.io/Thread-if-struct...dictionary
it's a perfect fit for your case