Python basic learning functions + modules + classes

print("------------- defines the function -------------");
def print_info():
# Print the prompt message to return to the input information
    print("Welcome to the Student Information Management System, please follow the prompts to enter the operation!")
    print("1. Add student information")
    print("2. Deletion of student information")
    print("3. Modification of student information")
    print("4. Access to student information")
    print("5. Browsing student information")
    print("6. Exit the system")
print("------------- call function -------------");
print_info()
D:\workspace\Python\venv\Scripts\ D:/workspace/Python/
-------------Defining Functions-------------
-------------call function-------------
Welcome to the Student Information Management System，Please follow the prompts to enter the operation！
1.Adding Student Information
2.Deleting Student Information
3.Modify student information
4.Access to student information
5.Browse Student Information
6.Log out of the system
The process has been completed,exit code0

print("------------- create class -------------");
class Stu:
    name = "Zhang San"
print()
D:\workspace\Python\venv\Scripts\ D:/workspace/Python/
-------------Creating Classes-------------
John Doe
The process has been completed,exit code0

print("------------- instance object -------------");
class Stu:
    # 'Define an attribute
    name = "Zhang San"
    age = 19
# Create an object of the Stu class
stu = Stu()
print("Student name:%s,age:%d" % (, ))
D:\workspace\Python\venv\Scripts\ D:/workspace/Python/
-------------instance object-------------
Student Name:John Doe,(a person's) age:19
The process has been completed,exit code0

print("------------- constructor ------------");
class Stu:
    # Constructor
    def __init__(self):
         = "Zhang San"
         = 1
    def displayCount(self):
        print("Student name: %s, student number %d" % (, ))
stu = Stu()
()
print("------------- destructor methods ------------");
class Stu:
    # Constructor
    def __init__(self, name, stuid):
         = name
         = stuid
    # Analyzing methods
    def __del__(self):
        print("Resources have been released")
stu = Stu("Zhang San", 1)
del stu  # Delete object Trigger destructor method
# del # This is a deletion of an attribute, not a deletion of an entire instance.
print("To carry out garbage collection.")
print("------------- encapsulates ------------");
# coding=utf-8
class JustCounter:
    __secretCount = 0  # Private variables
    publicCount = 0  # Public variables
    def count(self):
        self.__secretCount += 1
         += 1
        print(self.__secretCount)
counter = JustCounter()
()
()
print()
print(counter._JustCounter__secretCount)
D:\workspace\Python\venv\Scripts\ D:/workspace/Python/
-------------constructor method------------
Student Name：John Doe，student number1
-------------destructuring method------------
Released resources
Carry out garbage collection
-------------seal inside------------
1
2
2
2
The process has been completed,exit code0

print("Inheritance of class ------------- ------------");
# coding=utf-8
class Parent:  # Define the parent class
    parentAttr = 100
    def __init__(self):
        print("Call the parent class constructor.")
    def parentMethod(self):
        print("Calling parent class methods")
    def setAttr(self, attr):
         = attr
    def getAttr(self):
        print("Parent Class Attributes :", )
class Child(Parent):  # Define subclasses
    def __init__(self):
        print("Calling subclass constructor methods")

    def childMethod(self):
        print("Call child method child method")
c = Child()  # Instantiate subclasses
()  # Call methods of subclasses
()  # Call parent class methods
(200)  # Call the parent class method again
()  # Call the parent class method again
D:\workspace\Python\venv\Scripts\ D:/workspace/Python/
-------------Class Inheritance------------
Calling subclass constructors
Calling subclass methods child method
Calling parent class methods
Parent Class Attributes : 200
The process has been completed,exit code0