Functions and Modules Flashcards

What is a closure in Python?

Answer: A function that captures variables from its enclosing scope

A closure is a function that remembers the variables from its enclosing scope even after that scope has exited.

What does the `global` keyword do inside a function?

Answer: Declares that a variable refers to the global scope

`global` tells Python that the variable inside the function refers to the global namespace, not a local one.

What is a decorator in Python?

Answer: A function that wraps another function to add behavior

A decorator is a callable that takes a function and returns a new function with added behavior.

What does the `__name__ == '__main__'` guard do?

Answer: Prevents code from running when the module is imported

Code under `if __name__ == '__main__':` runs only when the script is executed directly, not when imported.

What is a generator function in Python?

Answer: A function using `yield` to produce a sequence lazily

A generator function uses `yield` to produce values one at a time, suspending state between calls.

Which keyword is used in a generator function to produce a value?

Answer: yield

`yield` suspends the function and sends a value to the caller, resuming on the next iteration.