integer_sum.py

"""
Script takes a target sum from the user, along with a list of integers, and displays the pairs of numbers in the list
which sum to the target given. 
"""
target_sum = int(input("Enter target sum: "))

addends = []
user_input = input("Please enter a number (Q to stop): ").lower()
# get integers from user until they choose to stop (assume user enters either integers or q for simplicity)
while user_input != "q":
    user_num = int(user_input)
    addends.append(user_num)

    user_input = input("Please enter a number (Q to stop): ").lower()

# for each number in the list
for i in range(len(addends)):
    num_1 = addends[i]
    # go through remaining numbers to the end of the list
    for j in range(i+1, len(addends)):
        num_2 = addends[j]
        potential_sum = num_1 + num_2
        if potential_sum == target_sum:
            print("{} + {} = {}".format(num_1, num_2, target_sum))