In this tutorial, we'll learn how to write a Python program that calculates the sum of numbers in a list without using any built-in functions. We’ll walk through the process step-by-step, starting with taking a list of numbers as input and then iterating through the list to add each element together. You’ll see how we can achieve this using basic Python concepts like variables and loops. I’ll also explain how to initialize variables, iterate over the list, and calculate the sum manually. Additionally, I'll show how you can modify the program to accept user input and compute the sum dynamically. By the end of this tutorial, you will have a solid understanding of how to work with lists and loops in Python, while also gaining an appreciation for writing code without relying on built-in functions.
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