Python_Single_List_2_Examples

  1. Traverse → forward & backward

  2. Search → find a student

  3. Update → change a student name

  4. Add → add at the end

  5. Delete → remove a student

  6. Sort → alphabetical & reverse alphabetical

  7. Reverse → create a reversed list without using reverse()

  8. First/Last Alphabetically → find first and last name

  9. Count Occurrences → count a student

  10. Insert → insert a student at a specific position

  12. Second student alphabetically

  13. Remove first student starting with a specific letter

  14. Display students with name length greater than 4


  1. # Single List of Students

    students = ["Alice", "Bobby", "Charlie", "David", "Frank", "Grace"]


    # -----------------------------

    # 1. Traverse the list (forward)

    # -----------------------------

    print("1. Traverse forward:")

    for i in range(len(students)):

        print(students[i])


    # -----------------------------

    # 2. Traverse the list (backward)

    # -----------------------------

    print("\n2. Traverse backward:")

    for i in range(len(students)-1, -1, -1):

        print(students[i])


    # -----------------------------

    # 3. Search for a student

    # -----------------------------

    search_student = "Charlie"

    found = False

    for i in range(len(students)):

        if students[i] == search_student:

            print("\n3. Search:", search_student, "found at index", i)

            found = True

            break

    if not found:

        print("\n3. Search:", search_student, "not found")


    # -----------------------------

    # 4. Update a student's name

    # -----------------------------

    # Update Bobby to Bob

    for i in range(len(students)):

        if students[i] == "Bobby":

            students[i] = "Bob"

            break

    print("\n4. After Update:", students)


    # -----------------------------

    # 5. Add a new student at the end

    # -----------------------------

    students = students + ["Hannah"]

    print("\n5. After Addition:", students)


    # -----------------------------

    # 6. Delete a student

    # -----------------------------

    # Delete Frank

    for i in range(len(students)):

        if students[i] == "Frank":

            for j in range(i, len(students)-1):

                students[j] = students[j+1]

            students = students[:len(students)-1]

            break

    print("\n6. After Deletion:", students)


    # -----------------------------

    # 7. Sort alphabetically (A-Z)

    # -----------------------------

    for i in range(len(students)):

        for j in range(i+1, len(students)):

            if students[i] > students[j]:

                temp = students[i]

                students[i] = students[j]

                students[j] = temp

    print("\n7. Sorted Alphabetically (A-Z):", students)


    # -----------------------------

    # 8. Sort reverse alphabetically (Z-A)

    # -----------------------------

    for i in range(len(students)):

        for j in range(i+1, len(students)):

            if students[i] < students[j]:

                temp = students[i]

                students[i] = students[j]

                students[j] = temp

    print("\n8. Reverse Sorted (Z-A):", students)


    # -----------------------------

    # 9. Reverse the list (without sort)

    # -----------------------------

    reversed_students = []

    for i in range(len(students)-1, -1, -1):

        reversed_students = reversed_students + [students[i]]

    print("\n9. Reversed List:", reversed_students)


    # -----------------------------

    # 10. First and last alphabetically

    # -----------------------------

    first_student = students[0]

    last_student = students[0]

    for i in range(1, len(students)):

        if students[i] < first_student:

            first_student = students[i]

        if students[i] > last_student:

            last_student = students[i]

    print("\n10. First Alphabetically:", first_student)

    print("10. Last Alphabetically:", last_student)


    # -----------------------------

    # 11. Count occurrences

    # -----------------------------

    count_student = "Alice"

    count = 0

    for i in range(len(students)):

        if students[i] == count_student:

            count += 1

    print("\n11. Occurrences of", count_student, ":", count)


    # -----------------------------

    # 12. Insert at specific position

    # -----------------------------

    # Insert "Irene" at index 3

    students = students[:3] + ["Irene"] + students[3:]

    print("\n12. After inserting Irene at index 3:", students)


    # -----------------------------

    # 13. Second student alphabetically

    # -----------------------------

    sorted_students = students[:]

    for i in range(len(sorted_students)):

        for j in range(i+1, len(sorted_students)):

            if sorted_students[i] > sorted_students[j]:

                temp = sorted_students[i]

                sorted_students[i] = sorted_students[j]

                sorted_students[j] = temp

    second_student = sorted_students[1]

    print("\n13. Second student alphabetically:", second_student)


    # -----------------------------

    # 14. Remove first student starting with 'D'

    # -----------------------------

    for i in range(len(students)):

        if students[i][0] == 'D':

            for j in range(i, len(students)-1):

                students[j] = students[j+1]

            students = students[:len(students)-1]

            break

    print("\n14. After removing first student starting with 'D':", students)


    # -----------------------------

    # 15. Display students with name length > 4

    # -----------------------------

    print("\n15. Students with name length > 4:")

    for i in range(len(students)):

        if len(students[i]) > 4:

            print(students[i])

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