Add Multiple Numbers in Python

# Add multiple numbers
# A small beginner python program
# The program uses list as data structure and
# sum() function to add multiple number from list


"""
Example-
python3 calc.py
Enter number separated via comma:1,2,3
output: 6

"""
user_input = input('Enter number separated via comma:')


str_numbers= user_input.split(',') # splitting string numbers by comma and creating a list

int_numbers=[]

for items in str_numbers:
    #converting all the string nums to int nums
    int_numbers.append(int(items))

print(sum(int_numbers))