closure_eval_demo.py

# Expanded version of Glyph's example at
# https://mastodon.social/@glyph/112628092787725236

def loop():
    for number in range(10):
        def closure():
            print("Inside the closure")
            return number
        print("Before yield")
        yield closure
        print("After yield")


# eagerly = [each() for each in loop()]
print("\nEagerly evaluate the closures, lazily iterate the generator\n")
generator = loop()
for each in generator:
    print(f"Function {each}")
    print(f"Result {each()}")


# lazily = [each() for each in list(loop())]
print("\nLazily evaluate the closures, eagerly iterate the generator\n")
evaluated = list(loop())
for each in evaluated:
    print(f"Function {each}")
    print(f"Result {each()}")