Lets start with an example of a context manager.
This is code without a context manager:
f = open("test_file", "w")
f.write("Test")
f.close()
Converting it to context manager in python,
with open("test_file", "a") as f:
f.write("test_write_from_context_manager\n")
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:
- Open/Setup/Enter
- Execute/Implement
- Close/Teardown/Exit
Examples of context managers:
- Open, read, close file
- Open connection of database, execute query, close connection of database
- Login, get data, logout
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