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OOP & classes

Classes, instances, methods, dataclasses, and object-oriented design in Python.

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OOP & classes easy

How to Build a Context Manager Class in Python

Create a reusable context manager class that opens and automatically closes resources using the with statement.

context-manager with-statement resource-management
Python 
class FileResource:
    def __init__(self, filename, mode='r'):
        self.filename = filename
        self.mode = mode
        self.file = None

    def __enter__(self):
        self.file = open(self.filename, self.mode)
        return self.file

    def __exit__(self, exc_type, exc_value, traceback):
        if se…
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