A Joke adder that just makes a string out of an addition equation input.

joke_adder.py

looper = True

# Continues to ask until a valid input is given
while looper:
    # Get input
    input_var = input("Please enter an addition formula.\n")
    
    # Needs to contain a + to be an addition problem.
    if "+" not in input_var:
        print("A valid addition formula has a + sign in it!\n")
    else:
        # Split the string to get out two numbers
        formula = input_var.split("+")
        
        # Makes sure the result contains at least to parts to eliminate input like "2+"
        if len(formula) >= 2:
            # Make sure there are ACTUALLY numbers on either side of the equation even if they are surrounded by letters
            result1 = any(chr.isdigit() for chr in formula[0])
            result2 = any(chr.isdigit() for chr in formula[1])
            
            # If there are numbers, remove any letters of special characters that might also exist
            if result1 and result2:
                digit1 = formula[0]
                for chr in digit1:
                    if chr.isdigit() == False:
                        digit1 = digit1.replace(chr,"")
                    
                digit2 = formula[1]
                for chr in digit2:
                    if chr.isdigit() == False:
                        digit2 = digit2.replace(chr,"")
                
                #Break out of the loop, we have two valid numbers!
                looper = False
            else:
                print("Not a valid formula!  You need two numbers to add!\n")

#print the string version of the addition, IE "2+2 = 22"
print(digit1+digit2)