Calculating the sum of elements in a list using a loop in Python is a straightforward process. Below is a step-by-step explanation, followed by a code example for better understanding.
###### Step-by-Step Guide

1. **Initialize a Variable**: Start by creating a variable to hold the sum. This variable is commonly initialized to zero.
2. **Iterate Over the List**: Use a loop to traverse through each element in the list.
3. **Add Each Element**: During each iteration of the loop, add the current element to the sum variable.
4. **Return or Print the Result**: After the loop completes, the variable containing the sum can be returned or printed.
###### Code Example

Here is a simple code snippet demonstrating these steps:
# Define the list of numbers
numbers = [10, 20, 30, 40, 50]
# Initialize sum variable
total_sum = 0
# Loop through each element in the list
for number in numbers:
total_sum += number # Add the current number to the total_sum
# Output the result
print("The sum of the list is:", total_sum)

###### Explanation of the Code

- **List Definition**: The variable *numbers* holds a list of integers.
- **Sum Initialization**: The variable *total_sum* starts at zero to ensure that the sum calculation begins correctly.
- **For Loop**: The *for* loop iterates over each element in the list. The loop variable *number* takes on the value of each element during each iteration.
- **Adding Elements**: The *+=* operator updates *total_sum* by adding the current *number*.
- **Output**: Finally, the result is displayed using a print statement.
###### Conclusion

Using a loop to sum the elements of a list in Python is an effective method, particularly when needing custom operations during summation or handling complex data structures. While built-in functions like *sum()* can achieve the same result in a more concise manner, understanding the looping mechanism is essential for deeper programming comprehension.