Define Multiple Python Classes in a Single File

Yes, it is recommended to define multiple Python classes in a single file.

If we define one class per file, we may end up creating a large number of small files, which can be difficult to keep track of. Placing all the interrelated classes in a single file increases the readability of the code.

If multiple classes are not interrelated, we can place them in different files (improves maintainability and scalability).

What is a Python class?

In Python, a class is a collection of objects. It is the blueprint from which objects are being created. It is a logical entity that contains some attributes and methods. Following is an example of a Python class -

class Tutorialspoint:
   print("Welcome to Tutorialspoint.")
    
obj1 = Tutorialspoint()

Multiple classes in a Single File

In Python, a file with a .py extension is known as a module. A single module/file may contain multiple classes.

Example

Following is an example of multiple classes in a single file -

#tutorialspoint.py
class Tutorialspoint:
   def __init__(self):
      print("Welcome to Tutorialspoint.")
    
   def Method1(self):
      print("Welcome to Python Tutorial.")
    
class Python(Tutorialspoint):
   def __init__(self):
      print("Welcome to Python Programming.")
        
   def Method2(self):
      print("Python is an interpreted language.")
         
class Java(Tutorialspoint):
   def __init__(self):
      print("Welcome to Java Tutorial.")     
        
Obj1 = Java()
Obj1.Method1()

Following is the output of the above code -

Welcome to Java Tutorial.
Welcome to Python Tutorial.