Python Coding challenge - Day 928| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Class

class Lock:

A class named Lock is created.

This class will be used as a context manager.

A context manager is an object that defines what should happen:

when entering a with block (__enter__)

when exiting a with block (__exit__)

2. Defining the __enter__ Method

    def __enter__(self):

        print("Start")

__enter__ is automatically called when execution enters the with block.

Here, it simply prints "Start".

3. Defining the __exit__ Method

    def __exit__(self, a, b, c):

        print("End")

__exit__ is automatically called when execution leaves the with block.

It runs whether:

the block finishes normally, or

an exception occurs.

The parameters a, b, and c are for exception details (type, value, traceback).

4. Using the Class with with

with Lock():

What happens internally:

Python creates a Lock() object.

Calls its __enter__() method → prints "Start".

Then executes the code inside the with block.

5. The Body of the with Block

    pass

pass means do nothing.

No output occurs here.

6. Exiting the with Block

After pass executes:

Python calls __exit__() automatically.

__exit__() prints "End".

7. Final Output

Start

End

400 Days Python Coding Challenges with Explanation