__enter__

Dunder MethodPython 2.0+Intermediate

Called at the start of a with block; returns the context resource

Quick Info

Documentation
Official Docs
Python Version
2.0+

Learn by Difficulty

Easy2 examples
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Intermediate2 examples
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Advanced1 example
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Expert1 example
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Quick Example

python
class Timer:
    def __enter__(self):
        import time
        self.start = time.time()
        print("Timer started")
        return self

    def __exit__(self, *args):
        import time
        elapsed = time.time() - self.start
        print(f"Elapsed: {elapsed:.4f}s")

with Timer():
    total = sum(range(1000000))
    print(f"Sum: {total}")

__enter__ called at the start of a with block; returns the context resource. Implementing it lets you customize how Python interacts with your objects.

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Tags

oopmagic-methodprotocolcore