1, Program function

1. Create a multi-level student information management system that can advance and retreat

2. Mind map

2, Student entity

1. Mind map

2. Relationship model

Student (student number, name, gender, age, class, major, Department, telephone)

3. Student documents

First save the student information to a text file and separate each field with a space

3, Read student files

1. Save multiple student information with a list of tuples

Create "save multiple student information with a list of tuples. py"

'''
Save multiple student information with tuple list
'''
# Define 6 student tuples
student1 = ('2021001', 'Li Xiaohong', 'female', '19', 'Software technology', 'College of artificial intelligence and big data', '15945456780')
student2 = ('2021002', 'Xiao Gang Wang', 'male', '18', 'Software technology', 'College of artificial intelligence and big data', '13890904567')
student3 = ('2021003', 'Tang Yuhan', 'female', '19', 'Software technology', 'College of artificial intelligence and big data', '18878789023')
student4 = ('2021101', 'Zhang Sanfeng', 'male', '18', 'Big data technology', 'College of artificial intelligence and big data', '15945456780')
student5 = ('2021102', 'Xiao rainforest', 'male', '18', 'Big data technology', 'College of artificial intelligence and big data', '18890904560')
student6 = ('2021103', 'Zheng Xiaocui', 'female', '19', 'Big data technology', 'College of artificial intelligence and big data', '15890904567')
# Create a list of student tuples
students = []
students.append(student1)
students.append(student2)
students.append(student3)
students.append(student4)
students.append(student5)
students.append(student6)

# Traverse student list
for student in students:
    for i in range(len(student)):
        print(student[i],end=' ')
    print()

Run the program and view the results

2. Read the student file data and save it to the tuple list

First look at the student file location

Create "read student file and save it to the list of elements. py"

'''
Read the student file and save it to the tuple list
'''

# Create an empty student list
students = []

#Open file as read-only
f = open('student.txt')

# Traverses the file object in rows
for line in f:
     # Remove the newline character from each line
     line = line.replace('\n', '')
     # Split each line with a space as a separator
     student = tuple(line.split(' '))
     #Add student tuples to student list
     students.append(student)

#Format output student list
for student in students:
     for i in range(len(student)):
          print(student[i],end=' ')
     print()

Run the program to view the results

3. Students encounter problems in operation

If you change the file code to the one shown in the figure above, there will be no file operation problem. There will be no error when reading the file. To read the file, remember to put the created program in the same folder as the file.

4, Add, delete, modify and query the list of student tuples

1. Add student records

'''
Add student tuples to list
'''
# Create an empty student list
students = []

#Open file as read-only
f = open('student.txt')

# Traverses the file object in rows
for line in f:
     # Remove the newline character from each line
     line = line.replace('\n', '')
     # Split each line with a space as a separator
     student = tuple(line.split(' '))
     #Add student tuples to student list
     students.append(student)

# Add a student tuple
new_student = ('2121004', 'Wu Wenyan', 'female', '18', '2021 Level 4 software class', 'Software technology', 'College of artificial intelligence and big data', '12345678901')
students.append(new_student)

# Output updated student tuple list
for student in students:
     for i in range(len(student)):
          print(student[i], end=' ')
     print()

Run the program to view the results

2. Query student records

(1) Query student records by student number

'''
Query student records by student number
'''
# Create an empty student list
students = []

#Open file as read-only
f = open('student.txt')

# Traverses the file object in rows
for line in f:
     # Remove the newline character from each line
     line = line.replace('\n', '')
     # Split each line with a space as a separator
     student = tuple(line.split(' '))
     #Add student tuples to student list
     students.append(student)

# The user inputs the student number from the keyboard
id = input('Please enter the student number to find the student:')
found = False
for student in students:
    if (student[0] == id ):
        found = True
        for i in range(len(student)):
            print(student[i], end=' ')
        break
if not found:
    print('Warm tip: the queried student does not exist!'.format(id))

Run the program to view the results

(2) . query by name

'''
Query by name
'''
# Create an empty student list
students = []

#Open file as read-only
f = open('student.txt')

# Traverses the file object in rows
for line in f:
     # Remove the newline character from each line
     line = line.replace('\n', '')
     # Split each line with a space as a separator
     student = tuple(line.split(' '))
     #Add student tuples to student list
     students.append(student)

# The user inputs the student number from the keyboard
name = input('Please enter the name of the student you are looking for:')
found = False
for student in students:
    if (student[1] == name ):
        found = True
        for i in range(len(student)):
            print(student[i],end= ' ')

if not found:
    print('Warm tip: the queried student does not exist!'.format(name))

Run the program to view the results

3. Modify student records

'''
Modify student records
'''
# Create an empty student list
students = []

#Open file as read-only
f = open('student.txt')

# Traverses the file object in rows
for line in f:
     # Remove the newline character from each line
     line = line.replace('\n', '')
     # Split each line with a space as a separator
     student = tuple(line.split(' '))
     #Add student tuple to student list
     students.append(student)

# Enter the student number of the student to be changed
id = input('Enter the student number of the student to be changed:')
found = False
for student in students:
    if (student[0] == id):
        found = True
        # Convert student tuples to lists
        student = list(student)
        new_age = input('Enter the modified age:')
        new_telephone = input('Enter a new number:')
        # Modify the value of the attribute specified by the student tuple
        student[3] = new_age
        student[7] = new_telephone
        # Restore list to metagroup
        student = tuple(student)
        print('Congratulations: student record modified successfully!')
        for i in range(len(student)):
            print(student[i], end=' ')
        break

if not found:
    print('Student number is{}My students didn't find it!'.format(id))

Run the program to view the results

4. Delete student records

'''
Delete student record
'''
# Create an empty student list
students = []

#Open file as read-only
f = open('student.txt')

# Traverses the file object in rows
for line in f:
     # Remove the newline character from each line
     line = line.replace('\n', '')
     # Split each line with a space as a separator
     student = tuple(line.split(' '))
     #Add student tuples to student list
     students.append(student)

# Enter the student number of the student to be deleted
id = input('Enter the student number of the student to be deleted:')
found = False
for student in students:
    if (student[0] == id):
        found = True
        #Delete list elements by value
        students.remove(student)
        print('Congratulations: student record deleted successfully!')
        break
if not found:
    print('Student number is{}My students didn't find it!'.format(id))
else:
    for student in students:
        for i in range(len(student)):
            print(student[i], end=' ')
        print()

Run the program to view the results

5, Writes a list of student tuples to a file

Write "write the list of student tuples to the file. py"

'''
Writes a list of student tuples to a file
'''

# Define 6 student tuples
student1 = ('2021001', 'Li Xiaohong', 'female', '90', 'Software technology', 'College of artificial intelligence and big data', '15945456780')
student2 = ('2021002', 'Xiao Gang Wang', 'male', '18', 'Software technology', 'College of artificial intelligence and big data', '13890904567')
student3 = ('2021003', 'Tang Yuhan', 'female', '19', 'Software technology', 'College of artificial intelligence and big data', '18878789023')
student4 = ('2021101', 'Zhang Sanfeng', 'male', '18', 'Big data technology', 'College of artificial intelligence and big data', '15945456780')
student5 = ('2021102', 'Xiao rainforest', 'male', '18', 'Big data technology', 'College of artificial intelligence and big data', '18890904560')
student6 = ('2021103', 'Zheng Xiaocui', 'female', '19', 'Big data technology', 'College of artificial intelligence and big data', '15890904567')
# Create a list of student tuples
students = []
students.append(student1)
students.append(student2)
students.append(student3)
students.append(student4)
students.append(student5)
students.append(student6)
# Output student list
print(students)


# Create a writable file
f = open('student.txt', 'w')
for student in students:
    student_line = ' '.join(student) + '\n'
    f.write(student_line)
# Close file
f.close()

print('The list of student tuples was written to the file successfully!')

Run the program to view the results

Then we refresh whether the student file has been written successfully.

Successfully written!

6, Constructing a multi-level menu system for student information management

Build a complete multi-level menu system

Programming - student information management py
All functions such as addition, deletion, modification and query are improved and operated completely.

def add_student():
    students = []

    f = open('student.txt')
    for line in f:
        line = line.replace('\n', '')
        student = tuple(line.split(' '))
        students.append(student)

    id = input('Student No.:')
    name = input('full name:')
    gender = input('Gender:')
    age = input('Age:')
    grade = input('Class:')
    major = input('Major:')
    department = input('Department:')
    telephone = input('Telephone:')

    students.append([id, name, gender, age, grade, major, department, telephone])

    f = open('student.txt', 'w')
    for i in range(len(students)):
        student = ' '. join(students[i]) + '\n'
        f.write(student)
    f.close()
    print('\n Congratulations, student record added successfully!\n')


def query_student():
    while True:
        print('Query student records')
        print('=' * 12)
        print('1.Query student records by student number')
        print('2.Query student records by name')
        print('3.Query all student records')
        print('4.Previous Menu ')
        print('=' * 12)
        mc3 = int(input('Enter menu number:'))
        if mc3 == 1:
            students = []

            f = open('student.txt')
            for line in f:
                line = line.replace('\n', '')
                student = tuple(line.split(' '))
                students.append(student)

            id = input('Please enter the student number to find the student:')
            found = False
            for student in students:
                if (student[0] == id):
                    found = True
                    for i in range(len(student)):
                        print(student[i], end=' ')
                    break
            if not found:
                print('Warm tip: the queried student does not exist!'.format(id))
        elif mc3 == 2:
            students = []

            f = open('student.txt')
            for line in f:
                line = line.replace('\n', '')
                student = tuple(line.split(' '))
                students.append(student)

            name = input('Please enter the name of the student you are looking for:')
            found = False
            for student in students:
                if (student[1] == name):
                    found = True
                    for i in range(len(student)):
                        print(student[i], end=' ')

            if not found:
                print('Warm tip: the queried student does not exist!'.format(name))
        elif mc3 == 3:
            students = []

            f = open('student.txt')
            for line in f:
                line = line.replace('\n', '')
                student = tuple(line.split(' '))
                students.append(student)

            for student in students:
                for i in range(len(student)):
                    print(student[i], end=' ')
                print()
        else:
            break


def modify_student():
    students = []

    f = open('student.txt')
    for line in f:
        line = line.replace('\n', '')
        student = tuple(line.split(' '))
        students.append(student)

    id = input('Enter the student number of the student to be changed:')
    found = False
    for student in students:
        if (student[0] == id):
            found = True
            student = list(student)
            new_age = input('Enter the modified age:')
            new_telephone = input('Enter a new number:')
            student[3] = new_age
            student[7] = new_telephone
            student = tuple(student)
            print('Congratulations: student record modified successfully!')
            for i in range(len(student)):
                print(student[i], end=' ')
            break

    if not found:
        print('Student number is{}My students didn't find it!'.format(id))

    f = open('student.txt', 'w')
    for i in range(len(students)):
        student = ' '.join(students[i]) + '\n'
        f.write(student)
    f.close()

def delete_student():
    students = []

    f = open('student.txt')

    for line in f:
        line = line.replace('\n', '')
        student = tuple(line.split(' '))
        students.append(student)

    id = input('Enter the student number of the student to be deleted:')
    found = False
    for student in students:
        if (student[0] == id):
            found = True
            students.remove(student)
            print('Congratulations: student record deleted successfully!')
            break
    if not found:
        print('Student number is{}My students didn't find it!'.format(id))
    else:
        for student in students:
            for i in range(len(student)):
                print(student[i], end=' ')
            print()

    f = open('student.txt', 'w')
    for i in range(len(students)):
        student = ' '.join(students[i]) + '\n'
        f.write(student)
    f.close()


def login():
    username = input('Enter user name:')
    password = input('Input password:')
    if username == 'XT' and password == '2021':
        while True:
            print('\n Student management system')
            print('=' * 13)
            print('1.Add student records')
            print('2.Query student records')
            print('3.Modify student records')
            print('4.Delete student record')
            print('5.Previous Menu ')
            print('=' * 13)
            mc2 = int(input('Enter menu number:'))
            if mc2 == 1:
                add_student()
            elif mc2 == 2:
                query_student()
            elif mc2 == 3:
                modify_student()
            elif mc2 == 4:
                delete_student()
            else:
                break
    else:
        print('\n Wrong user name or password, please login again!\n')

# main program
while True:
    print('User login')
    print('=' * 8)
    print('1.Sign in')
    print('2.sign out')
    print('=' * 8)
    mc1 = int(input('Enter menu number:'))
    if mc1 == 1:
        login()
    elif mc1 == 2:
        print('\n Thank you for using this program!\n')
        break

7, Summary

The student management system is still a little difficult, and you should be careful when writing, otherwise it is easy to make mistakes. Write in the way you are good at, which is convenient for subsequent correction.
Whether python is difficult or not is not simple, mainly because everyone 1 should insist on doing it.