Next on generators doesn't resume with last call

Question

Why the second next doesn't return "bye" ?

def salute():
    yield "hello"
    yield "bye"


def greet_me():
    print(next(salute()))
    print(next(salute()))

greet_me()

Output :

hello

hello

Answer 1

Because you're creating a new generator each time you call salute(). Create the generator once and then call next on it to get both yields to yield their value:

def greet_me():
    gen = salute()    # create the generator
    print(next(gen))  # start it, goes to the first yield
    print(next(gen))  # resume it, goes to second yield

Calling greet_me now prints the expected results.