9. Problem to create a class with single inheritance in Python

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In this Python oops program, we will create a class with single inheritance. The program demonstrates inheritance in Python. The ChildClass inherits the parent_method from the ParentClass and adds its own method child_method. 

Class with single inheritance

Steps to solve the program
  1. In this program, we demonstrate single inheritance in Python, where a child class inherits from a single parent class.
  2. The ChildClass inherits the parent_method from the ParentClass, allowing the object obj of the ChildClass to access and invoke both the parent class method (parent_method) and its own class method (child_method).
  3. This concept of inheritance allows for code reuse and enables the child class to extend or override the functionality of the parent class.
  4. The program output will be: It first prints “Parent method” because obj.parent_method() invokes the method from the parent class. Then it prints “Child method” because obj.child_method() invokes the method from the child class.

				
					class ParentClass:
    def parent_method(self):
        print("Parent method")

class ChildClass(ParentClass):
    def child_method(self):
        print("Child method")

# Create an object of the child class
obj = ChildClass()
obj.parent_method()
obj.child_method()

Output:

				
					Parent method
Child method

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8. Problem to write Python class under the given syntax

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In this Python oops program, we will write python class under syntax if __name__ == ‘__main__’. The program demonstrates the usage of a class with a constructor and a method. It creates an object, initializes its name attribute, and displays the name using the display_name method. The code is enclosed in an if __name__ == '__main__': block to ensure it only runs when the script is executed directly.

Write Python class under given syntax

Steps to solve the program
  1. The code demonstrates the use of the __name__ variable in Python, which provides information about the current module’s name.
  2. By using the if __name__ == ‘__main__’: condition, we can ensure that certain code within the block is executed only when the module is run directly as the main program.
  3. In this case, the MyClass class is defined, and an object obj is created with the name “Jason” passed as an argument to the constructor.
  4. The display_name method is then called on the obj object, which prints the name stored in the instance variable self.name.
  5. The use of if __name__ == ‘__main__’: is a common practice in Python to separate code that should only run when the module is run as the main program from code that should not be executed when the module is imported as a module in another program.

				
					class MyClass:
    def __init__(self, name):
        self.name = name
    
    def display_name(self):
        print("Name:", self.name)

if __name__ == '__main__':
    obj = MyClass("Jason")
    obj.display_name()

Output:

				
					Name: Jason

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Python Class to get the class name and module name.

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Python class with Single Inheritance.

7. Problem to create Python class to get class and module name

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In this Python oops program, we will create python class to get class and module name. The program demonstrates how to retrieve the class name and module name of an object in Python.

Create Python class to get class and module name

Steps to solve the program
  1. The code demonstrates how to get the class name and module name of an object in Python.
  2. After creating an object obj of the MyClass class, we use the __class__.__name__ attribute to get the name of the class to which obj belongs. This attribute returns a string containing the class name.
  3. The __module__ attribute, on the other hand, returns the name of the module where the class is defined. In this case, since the code is executed directly without being imported as a module, the __module__ attribute will return “__main__” indicating that the class is defined in the main module.
  4. By printing the class name and module name, we can observe the names associated with the object obj of the MyClass class.

				
					class MyClass:
    pass

obj = MyClass()
print("Class name:", obj.__class__.__name__)
print("Module name:", obj.__module__)

Output:

				
					Class name: MyClass
Module name: __main__

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6. Problem to create Python class with class method

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In this Python oops program, we will create a Python class with class method. The program demonstrates the usage of a Python class with class method. The class_method is defined within the MyClass class and can be called directly on the class itself. It accesses and prints the value of the class variable class_var.

Python class with class method

Steps to solve the program
  1. The code demonstrates the usage of a class method within a class in Python.
  2. Class methods are defined using the @classmethod decorator before the method definition. They receive the class itself as the first parameter, conventionally named cls. Class methods are commonly used when the method needs to access or modify class-level variables or perform some operation specific to the class itself.
  3. In this case, the class_method() is a method that prints the value of the class_var class variable when called. The class variable can be accessed using cls.class_var, where cls refers to the class itself.
  4. To invoke a class method, we use the class name followed by the method name, like MyClass.class_method(). Since class methods are associated with the class itself, they can be called without creating an object of the class.
  5. Class methods are useful when you want to define methods that are related to the class as a whole and not specific to any particular instance. They can access class variables and perform operations that affect the class itself.

				
					class MyClass:
    class_var = "Hello"
    
    @classmethod
    def class_method(cls):
        print("Class variable:", cls.class_var)

MyClass.class_method()

Output:

				
					Class variable: Hello

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Python Class to get the class name and module name.

5. Problem to create a Python class with static methods

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In this Python oops program, we will create a Python class with static methods. The program demonstrates the usage of a static method in Python. The static method static_method is defined within the MyClass class and can be called directly on the class itself.

Python class with static methods

Steps to solve the program
  1. The code demonstrates the usage of a class with static methods in Python.
  2. Static methods are defined using the @staticmethod decorator before the method definition. They do not receive any special first parameter like self or cls. Therefore, they do not have access to the instance or class variables.
  3. In this case, the static_method() is a simple method that prints the string “This is a static method” when called.
  4. To invoke a static method, we use the class name followed by the method name, like MyClass.static_method(). Since static methods are associated with the class itself, they can be called without creating an object of the class.
  5. Static methods are commonly used when a method does not require access to instance or class variables, and its behavior is independent of the specific instances of the class. They provide a way to encapsulate utility or helper functions within a class.
				
					class MyClass:
    @staticmethod
    def static_method():
        print("This is a static method")

MyClass.static_method()

Output:

				
					This is a static method

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4. Problem to create a Python class with class variables

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In this Python oops program, we will create a Python class with class variables. The program demonstrates the usage of a class variable in Python.

Python class with class variables

  1. The code demonstrates the usage of a Python class with class variables.
  2. A class variable is a variable that is shared by all instances of a class. It is defined within the class but outside any methods.
  3. In this case, the class_var class variable is assigned the value “Hello” within the MyClass class definition.
  4. By accessing MyClass.class_var, we can directly retrieve and print the value of the class_var class variable, which will output “Hello” in this case.
  5. Class variables are useful when you want to define attributes that are common to all instances of a class.
  6. They are shared among all instances and can be accessed without creating an object of the class.

				
					class MyClass:
    class_var = "Hello"

print(MyClass.class_var)

Output:

				
					Hello

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3. Problem to create a Python class with instance method

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In this Python oops program, we will create a Python class with instance method. The program creates a class with a constructor and methods to display and update the name attribute of an object. It creates an object, displays its initial name, updates the name, and then displays the updated name.

Python class with instance method

Steps to solve the program
  1. The code demonstrates how to create a Python class with instance method and variables for updating and displaying the value of an attribute.
  2. The constructor method __init__() is used to initialize the name instance variable when an object is created.
    The display_name() method allows us to print the value of the name instance variable.
  3. The update_name() method provides a way to update the value of the name instance variable by passing a new name as a parameter.
  4. By combining these methods, we can create objects of the MyClass class, set and update the name attribute, and display the updated name whenever needed. In the example, the name is initially set to “Omkar” and then updated to “Ketan”.
				
					class MyClass:
    def __init__(self, name):
        self.name = name
    
    def display_name(self):
        print("Name:", self.name)
    
    def update_name(self, new_name):
        self.name = new_name

# Create an object of the class
obj = MyClass("Omkar")
obj.display_name()

obj.update_name("Ketan")
obj.display_name()

Output:

				
					Name: Omkar
Name: Ketan

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2. Problem to create a Python class with instance variables

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In this Python oops program, we will create a Python class with instance variables. The program creates a class with a constructor that initializes an instance variable and then creates an object of that class to access and print the value of the instance variable.

Python class with instance variables.

Steps to solve the program
  1. The code demonstrates the usage of an instance variable within a class in Python.
  2. An instance variable is a variable that is specific to each instance (object) of a class. In this case, the instance_var instance variable is created within the constructor method __init__().
  3. When an object of the MyClass class is created, the constructor is called, and the instance_var instance variable is initialized with a value of 25.
  4. By accessing obj.instance_var, we can retrieve and print the value of the instance_var instance variable for the obj object, which will output 25 in this case.
  5. Instance variables provide a way to store and access data that is unique to each instance of a class.

				
					class MyClass:
    def __init__(self):
        self.instance_var = 25

# Create an object of the class
obj = MyClass()
print(obj.instance_var)

Output:

				
					25

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1. Problem to create a Python class constructor program

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In this Python oops program, we will create a Python class constructor program. We will create a class in Python using a constructor with the help of the below-given steps.

Python class constructor

Steps to solve the program
  1. The code demonstrates the creation of a class MyClass and the usage of its constructor method and a simple instance method.
  2. The constructor method __init__() is used to initialize the object’s state. In this case, it takes a name parameter and assigns it to the instance variable self.name.
    The display_name() method provides a way to access and display the value of the name instance variable. It is called on an object of the class and prints the name to the console.
  3. By using classes, objects, and methods, we can create reusable and organized code structures in Python. In this example, the MyClass class allows us to create objects with a name attribute and display that name whenever needed.

				
					class MyClass:
    def __init__(self, name):
        self.name = name
    
    def display_name(self):
        print("Name:", self.name)

# Create an object of the class
obj = MyClass("Omkar")
obj.display_name()

Output:

				
					Name: Omkar

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1. Python Variable Tutorial: A Comprehensive Guide

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Python Variable:

Introduction:
Variables are an important concept in any programming language, including Python. In simple language, a variable is a named location in memory that stores a value. In Python, you can use variables to store any type of data, including numbers, strings, and even complex data structures like lists and dictionaries.

Creating Variables in Python:

To create a variable in Python, you need to give it a name and assign a value to it. Here’s an example:
Name = “ Omkar “
Age = 25
Profession = “Software Engineer “
In the example above, we created three variables: Name, Age, and Profession.
The name variable is a string.
The age variable is an integer.
The Profession variable is also a string.

 

Python Variable Naming Rules:

When creating variables in Python, there are a few rules that you need to follow:
1. Variable names must start with a letter or underscore (_), followed by any combination of letters, digits, and underscores.
2. Variable names are case-sensitive, which means name and Name are two different variables.
3. A variable name cannot start with a number.
4. A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ ).

Python Variable Types:

Python Variable types:
1. Numbers – Consists of integers, floating-point numbers, and complex numbers.
2. Strings – Consists of characters in quotes.
3. Booleans – Consists of True or False values.
4. Lists – Consists of ordered sequences of elements.
5. Tuples – Consists of ordered, immutable sequences of elements.
6. Sets – Consists of unordered collections of unique elements.
7. Dictionaries – Consists of unordered collections of key-value pairs.

Checking types of the variable:
First, we will create some Python variable.
Name = “ Omkar “
Age = 25
Height = 5.8 ft

To check the type of the variable use the type() function.
print(type(Name)) #Output: <class ‘str’>
print(type(Age)) #Output: <class ‘int’>
print(type(Height)) #Output: <class ‘float’>

Python variable assignment types:

Value Assignment:

To assign the value to a Python variable use equal sign ( = ).
Example:
A = 10
We can also assign the same value to multiple Python variables.
A = B = C = 10

Multiple value assignment:

We can assign different values to different Python variables at the same time. We separate the variables and their values by ‘ , ‘.
Example:
a, b, c = 40, 50, 60
Here,
Value of variable a is 40 , b is 50 and c is 60.

Python Variable scope:

Scope of Variable:

In Python, the scope of a variable determines where in the code the variable can be accessed and used. The scope of a variable is defined by where the variable is created and assigned a value.
There are two types of Python variable scopes: global scope and local scope.

1. Global Scope: Variables created outside of any function or class have a global scope. This means that they can be accessed and modified from anywhere in the code, including within functions and classes.
Example:
number = 100 # global Python variable

def print_number():
print(number) # accessing global variable

def modify_number():
global number # declaring number as global variable
number = 200 # modifying global variable

print_number() # Output: 100
modify_number()
print_number() # Output: 200
In the example above, the variable number is declared outside of any function, so it has a global scope. The function print_number() can access and print the value of the number, and the function modify_number() can modify the value of the number by declaring it as a global variable using the global keyword.

2. Local Scope: Variables created inside a function or class have a local scope. This means that they can only be accessed and modified within that function or class.
Example:
def my_function():
number = 100 # local Python variable
print(number) # accessing local variable

my_function() # Output: 100
print(number) # NameError: name ‘number’ is not defined

Basic Mathematical operations using variables:

Creating variables and assigning value to them:
a, b = 10 , 20

Performing operations and printing output:
print(a+b) #Output: 30
print(a-b) #Output: -10
print(a*b) #Output: 200
print(a/b) #Output: 0.5

Variables are an important concept in Python programming language. They allow you to store and manipulate data in your code and are important for writing effective programs. By understanding how to create, name, and use variables, you can write Python code that is easy to read and maintain.