Modify with validation

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repeat = True

while repeat == True:
    print("Enter student name")
    student_name = input()
    student_name = student_name + "\n"

    data_file = open("StudentInfo.txt", "a")
    data_file.write(student_name)
    data_file.close()

    print("Enter another student? y/n")
    choice = input()

    if choice == "n":
        repeat = False
        print("Goodbye!")