open() — Advanced Playground

Opens a file and returns a file object for reading or writing

Python Playground

# open() - implementing the protocol
class Custom:
    def __open__(self):
        return "custom result"

obj = Custom()
print(open(obj))

Output

Click "Run" to execute your code

Understanding the dunder methods that open() calls helps you customize behavior for your own classes.

Try modifying the code above to explore different behaviors. Can you extend the example to handle a new use case?