Short Answer 
To find the maximum integer in a list, initialize a variable `max_num` to a very small value, iterate through the list updating `max_num` whenever a larger value is found, and return `max_num` as the final result.
Step 1: Initialize the Maximum Value
Begin by creating a variable, named max_num, and set it to a very small value, such as negative infinity. This ensures that any number in the list will be larger than this initial value.
Step 2: Iterate Through the List
Next, loop through each element in the input list, referred to as my_list. For each element, check if it exceeds the current maximum value stored in max_num. If it does, update max_num to this new value.
Step 3: Return the Maximum Value
Once you have completed the iteration through the list, max_num will contain the maximum integer found. Finally, return max_num as the function’s output, which will now accurately reflect the highest integer value from the provided list.