Context managers handle resource setup and teardown, ensuring cleanup even on errors. Beyond with open(), create custom ones using classes or contextlib.

Using a Class:

class ManagedFile:
    def __init__(self, filename):
        self.filename = filename

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

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

# Usage
with ManagedFile('hello.txt') as f:
    f.write('Hello, context manager! 👋')

Using contextlib:

from contextlib import contextmanager

@contextmanager
def managed_file(filename):
    try:
        f = open(filename, 'w')
        yield f
    finally:
        f.close()

# Usage
with managed_file('hello2.txt') as f:
    f.write('Even cleaner! 🧼')

This is the Pythonic way for resource management.