Conditional handling in Python

The script I coded has 3 outcomes, it either solves the factorial of a number, or it gives a message that the value input is not positive, or it will give a message that it is not a number, but the not a number outcome does not work.

user_number_input = input('Insert number: ')#This asks the user to input a number.
uni_int = int(user_number_input)


if uni_int < 0: #This checks if the number is negative, it will print an error message.
        print('Not a positive number!')
elif uni_int > 0:
    
    factorial_value = 1 #This is to ensure the calculation starts at 1 and not 0.
    while uni_int > 1: #Multiply number_inserted until 1 (n! = n x (n-1) x (n-2)...x 2 x 1)
         factorial_value *= uni_int #This is where the multiplication takes place, eg: 5 * 5 - 1 * 5 - 2...
         uni_int -= 1 #This ensures we move closer to 1, like within the formula (n! = n x (n-1) x (n-2)...x 2 x 1)<--- 1 is the end.
    print(factorial_value)
elif user_number_input != int and user_number_input == ' ':
   print('Not a number!')

I tried to rearrange the code so that the first conditional would check if the value is not a numbe, but then the last conditional does not work, which would be to check if the value is a positive number.

>Solution :

You will have ValueError when have input like "s12" in your second line. For avoid this problem use try – except firstly try if your input can be converted int or not. If not your output will be "Not a number", if can be convert to int then will follow other statements. I hope you can understand and it can help you. If you have any other question feel free to ask.

user_number_input = input('Insert number: ')#This asks the user to input a number.

try:
    uni_int = int(user_number_input)

    if uni_int < 0: #This checks if the number is negative, it will print an error message.
            print('Not a positive number!')
    elif uni_int > 0:
        
        factorial_value = 1 #This is to ensure the calculation starts at 1 and not 0.
        while uni_int > 1: #Multiply number_inserted until 1 (n! = n x (n-1) x (n-2)...x 2 x 1)
            factorial_value *= uni_int #This is where the multiplication takes place, eg: 5 * 5 - 1 * 5 - 2...
            uni_int -= 1 #This ensures we move closer to 1, like within the formula (n! = n x (n-1) x (n-2)...x 2 x 1)<--- 1 is the end.
        print(factorial_value)

except ValueError: 
   print('Not a number!')