https://www.w3schools.com/python/python_inheritance.asp

University of Michigan - Ann Arbor

•Class inheritance is the process by which a derived class is written based on a base class. Derived classes have the same functionality as the base class, unless otherwise changed. In the example below, Class B would inherit Class A’s methods and properties and a programmer can specify additional characteristics of the derived class.

Class Inheritance 

Inheritance Source

https://www.programiz.com/python-programming/inheritance

To define a subclass in Python, you can use the following syntax:
```python
class ParentClass():
    def __init__(self):
        self.some_attribute = 5

    def some_function(self, x):
        return self.some_attribute + x

class SubClass(ParentClass):
    some_new_attribute = self.some_attribute + 7

    def some_new_function(self):
        return self.some_function(some_new_attribute)
```
An instance of the class SubClass will inherit the methods and attributes of ParentClass.

Defining a Subclass in Python

```python
class Person:
  def __init__(self, fname, lname):
    self.firstname = fname
    self.lastname = lname

  def printname(self):
    print(self.firstname, self.lastname)

class Student(Person):
  def __init__(self, fname, lname, year):
    super().__init__(fname, lname)
    self.graduationyear = year

  def welcome(self):
    print("Welcome", self.firstname, self.lastname, 
          "to the class of", self.graduationyear)

x = Student("Mike", "Olsen", 2019)
x.welcome()
```

Output:
Welcome Mike Olsen to the class of 2019

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