Calculate factorials.py

# Declare and initialise variables
# Prompt and collect the number the user wants to get the factorial of
userInput = input("Input a positive integer to calculate it's factorial: ")
factorial = 1

# First try block tries to parse input as a float,
# Which allows decimal points, but throws (fails) when parsing letters,
# Such as "foo bar"

try:
    # Check if it's numbers like 45 3424 34.5
    float(userInput)

    # Second try block tries to parse input as a integer,
    # Decimal points will fail here, and the except code will run
    
    try:
        # Check if it's numbers like 1 2 45
        
        # (Can also use modulus to check if number input is an integer)
        # Which is probably better pratice than using a try

        # https://stackoverflow.com/questions/5424716/how-to-check-if-string-input-is-a-number
        #
        userInput = int(userInput)

        # Check if the user has inputted a number higher than 1
        if userInput >= 0:
            # Input is correct, an integer and more than 0

            # Actually calculate factorial
            for i in range (1, userInput + 1):
                factorial = factorial * i
            print("Factorial of ", userInput , " is: ", factorial)
        else:
            # Input is an integer, but less than 0
            print("Input must be positive")
            
    except ValueError:
    # Run if int(userInput) fails
        print("Input must not contain decimals (must be a integer)")
        
except ValueError:
    # Run if float(userInput) fails
    print("Input must be a number")


# There's probably more comments than code