Quick Tip: Python Context Managers

Quick Tip

Python context managers:

# Built-in context managers
with open('file.txt', 'r') as f:
    content = f.read()

# Custom context manager
class FileManager:
    def __init__(self, filename, mode):
        self.filename = filename
        self.mode = mode

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

    def __exit__(self, exc_type, exc_val, exc_tb):
        if self.file:
            self.file.close()

with FileManager('file.txt', 'w') as f:
    f.write("Hello, World!")

# Using contextlib
from contextlib import contextmanager

@contextmanager
def timer():
    start = time.time()
    yield
    end = time.time()
    print(f"Elapsed: {end - start} seconds")

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