1. import random
2. import sys
3. import datetime
4.  
5.  
6. class StudentManagementSystem:
7.     def __init__(self):
8.         self.students = []
9.         self.courses = []
10.         self.passed_courses = []
11.  
12.     def add_student(self):
13.         first_name = input("Enter the first name of the student: ")
14.         last_name = input("Enter the last name of the student: ")
15.         major = input("Select student's major (CE, EE, ET, ME, SE): ")
16.  
17.         if not self.is_valid_name(first_name) or not self.is_valid_name(last_name):
18.             print("Names should contain only letters and start with capital letters.")
19.             return
20.  
21.         current_year = datetime.datetime.now().year
22.         student_id = random.randint(10000, 99999)
23.  
24.         email = f"{first_name.lower()}.{last_name.lower()}@lut.fi"
25.         student_data = (student_id, first_name, last_name, current_year, major, email)
26.         self.students.append(student_data)
27.  
28.         with open("students.txt", "a") as f:
29.             f.write(','.join(map(str, student_data)) + 'n')
30.  
31.         print("Student added successfully!")
32.  
33.     def search_items(self, file_path, search_term, item_type):
34.         if len(search_term) < 3:
35.             print("Search term should contain at least 3 characters.")
36.             return
37.  
38.         with open(file_path, "r") as f:
39.             items = f.readlines()
40.  
41.         matching_items = [item for item in items if search_term in item]
42.         if matching_items:
43.             print(f"Matching {item_type}s:")
44.             for item in matching_items:
45.                 item_info = item.strip().split(",")
46.                 print(f"ID: {item_info[0]}, {item_type.capitalize()}: {item_info[1]}")
47.         else:
48.             print(f"No matching {item_type}s found.")
49.  
50.     def search_student(self):
51.         search_term = input("Give at least 3 characters of the student's first or last name: ")
52.         self.search_items("students.txt", search_term, "student")
53.  
54.     def search_course(self):
55.         search_term = input("Give at least 3 characters of the course name or teacher's name: ")
56.         self.search_items("courses.txt", search_term, "course")
57.  
58.     def is_valid_name(self, name):
59.         return name.isalpha() and name.istitle()
60.  
61.     def add_course_completion(self):
62.         course_id = input("Give the course ID: ")
63.         student_id = input("Give the student ID: ")
64.  
65.         grade = input("Give the grade (1-5): ")
66.         if not grade.isdigit() or not (1 <= int(grade) <= 5):
67.             print("Grade is not a correct grade.")
68.             return
69.  
70.         date_str = input("Enter a date (DD/MM/YYYY): ")
71.         try:
72.             date = datetime.datetime.strptime(date_str, "%d/%m/%Y")
73.             today = datetime.datetime.now()
74.  
75.             if date > today:
76.                 print("Input date is later than today. Try again!")
77.                 return
78.  
79.             if (today - date).days > 30:
80.                 print("Input date is older than 30 days. Contact 'opinto'.")
81.                 return
82.         except ValueError:
83.             print("Invalid date format. Use DD/MM/YYYY. Try again!")
84.             return
85.  
86.         with open("passed.txt", "r") as f:
87.             passed_courses = f.readlines()
88.  
89.         for i, line in enumerate(passed_courses):
90.             if line.startswith(course_id + "," + student_id):
91.                 old_grade = int(line.strip().split(",")[-1])
92.                 if int(grade) <= old_grade:
93.                     print(f"Student has passed this course earlier with grade {old_grade}")
94.                     return
95.                 passed_courses[i] = f"{course_id},{student_id},{date_str},{grade}n"
96.                 with open("passed.txt", "w") as f:
97.                     f.writelines(passed_courses)
98.                 print("Record updated!")
99.                 return
100.  
101.         with open("passed.txt", "a") as f:
102.             f.write(f"{course_id},{student_id},{date_str},{grade}n")
103.         print("Record added!")
104.  
105.     def show_student_record(self):
106.         student_id = input("Enter the student ID: ")
107.  
108.         with open("students.txt", "r") as f:
109.             students = f.readlines()
110.  
111.         student_info = [s.strip().split(",") for s in students if student_id in s][0]
112.  
113.         with open("passed.txt", "r") as f:
114.             passed_courses = f.readlines()
115.  
116.         with open("courses.txt", "r") as f:
117.             courses_info = f.readlines()
118.  
119.         student_courses = []
120.         total_credits = 0
121.         total_grade = 0
122.  
123.         for line in passed_courses:
124.             if line.startswith(student_id):
125.                 course_id, date_str, grade = line.strip().split(",")[:3]
126.                 total_grade += int(grade)
127.                 date = datetime.datetime.strptime(date_str, "%d/%m/%Y")
128.                 course_info = [c.strip().split(",") for c in courses_info if course_id in c][0]
129.                 course_name, credits, teachers = course_info[1], course_info[2], course_info[3]
130.                 student_courses.append((course_id, course_name, credits, date_str, teachers, grade))
131.                 total_credits += int(credits)
132.  
133.         if student_info:
134.             print("Student ID:", student_id)
135.             print("Name:", student_info[1], student_info[2])
136.             print("Starting year:", student_info[3])
137.             print("Major:", student_info[4])
138.             print("Email:", student_info[5])
139.  
140.             if student_courses:
141.                 print("Passed courses:")
142.                 for course in student_courses:
143.                     course_id, course_name, credits, date_str, teachers, grade = course
144.                     print(f"Course ID: {course_id}, Name: {course_name}, Credits: {credits}, Date: {date_str}, Teacher(s): {teachers}, Grade: {grade}")
145.  
146.                 average_grade = total_grade / len(student_courses)
147.                 print(f"Total credits: {total_credits}, Average grade: {average_grade:.1f}")
148.             else:
149.                 print("No passed courses.")
150.         else:
151.             print("Student not found.")
152.  
153.     def main_menu(self):
154.             print("You may select one of the following:n1) Add studentn2) Search studentn3) Search coursen4) Add course completionn5) Show student's recordn0) Exit")
155.             choice = input("What is your selection? ")
156.  
157.             if choice == "1":
158.                 self.add_student()
159.             elif choice == "2":
160.                 self.search_student()
161.             elif choice == "3":
162.                 self.search_course()
163.             elif choice == "4":
164.                 self.add_course_completion()
165.             elif choice == "5":
166.                 self.show_student_record()
167.             elif choice == "0":
168.                 print("Exiting the program.")
169.                 sys.exit()
170.             else:
171.                 print("Invalid input. Please select a valid option.")
172.  
173.  
174. if __name__ == "__main__":
175.     system = StudentManagementSystem&#40;&#41;
176.     while 1:
177.         system.main_menu()