make an integer with multiple python code example

Example 1: how to add numbers in python using for loop

n = input("Enter Number to calculate sum")
n = int (n)
sum = 0
for num in range(0, n+1, 1):
    sum = sum+num
print("SUM of first ", n, "numbers is: ", sum )

Example 2: addition of array in python with input

#Python program to add all the array elements using the built-in function
lst = []
num = int(input("Enter the size of the array: "))
print("Enter array elements: ")
for n in range(num):
  numbers = int(input())
  lst.append(numbers)
print("Sum:", sum(lst))