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OOP & classes

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

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How to Lazy Load an Expensive Attribute with a Proxy in Python

This code shows a Proxy class that lazily loads an ExpensiveResource only when first accessed, caching it for subsequent uses.

lazy-loading proxy properties
Python 
class ExpensiveResource:
    def __init__(self, name):
        self.name = name
        print(f"Expensive resource '{name}' created (e.g., DB connection)")

    def use(self):
        return f"Using {self.name}"

class Proxy:
    def __init__(self, name):
        self._name = name
        self._resource = None

    @p…
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