Simplifying context managers in python

Lets start with an example of a context manager.

This is code without a context manager:

Converting it to context manager in python,

Lets create a custom context manager.

Using the 4 step process in the diagram above above, any code can be converted in context manager.

Context managers can be used in situations when the code has the below structure:

1. Open/Setup/Enter
2. Execute/Implement
3. Close/Teardown/Exit

Examples of context managers:

1. Open, read, close file
2. Open connection of database, execute query, close connection of database
3. Login, get data, logout