First let me show you the code to explain what's the problem. #This is the second version of the marks analysis program L = [] #This list will contain both marks and subject S = [] M = []#This list will only contain marks, for calculation purpose def help_dialogue(): print("================HELP DIALOGUE=================") print("Press 1 to add marks to the list ") print("Press 2 to delete recent marks") print("Press 3 to display mark list") print("Press 4 to display total marks") print("Press 5 to display average marks") print("Press 6 to exit (Changes will not be saved") print("Press 7 to show help dialogue again") print("==============================================") def add_marks(): sub = input("Enter Subject name : ") marks = int(input("Enter Marks : ")) L.append((sub, marks)) S.append(sub) M.append(marks) def print_marksheet(): print(L) def average_marks(): y = sum(M)/len(M) return y def total_marks(): c = (sum(M)) return c def delete_recent_marks(): L.pop() M.pop() help_dialogue() while True: choice = int(input("Enter your choice: ")) if choice == 1: add_marks() elif choice == 2: delete_recent_marks() elif choice == 3: print_marksheet() elif choice == 4: print(f"The total marks is {total_marks()}") elif choice == 5: print(f"The average marks is {average_marks()}") elif choice == 6: break elif choice == 7: help_dialogue() else: print("Invalid choice") print("Thank you for using this program") So in line 22 def print_marksheet(): print(L) It just plainly prints the tuples (As expected from the code). But i want the code to print it more user friendly way. Input: L = [('English', 78) , ('Mathematics', 99)] Output:- English => 78 Mathematics => 99 So , I tried at first using for loop; def print_marksheet(): for subject in range(S): But here is the moment that i realize. That 'for' loop wasn't looping for the string and asked for integer. Here is the error I got: Traceback (most recent call last): File "C:\\Users\\v\*\*\*\\PycharmProjects\\PythonProject\\Marks analysis_v2.py", line 42, in \<module\> print_marksheet() \~\~\~\~\~\~\~\~\~\~\~\~\~\~\~^^ File "C:\\Users\\v\*\*\*\*\\PycharmProjects\\PythonProject\\Marks analysis_v2.py", line 23, in print_marksheet for subject in range (L): \~\~\~\~\~\~^^^ TypeError: 'list' object cannot be interpreted as an integer Then i searched in internet and found the command enumerate(). But i don't think so it would work for me. (And just in case this command works then please explain me how to use.) How to implement the user-friendly output? Continue reading...