Python Generators

Generators.py

# Reference : http://book.pythontips.com/en/latest/generators.html

def gen_func():
    for i in range(3):
        yield i


gen = gen_func()

# Both the dirs below are different. I initially
# thought they be same but I think the language
# semantics mean something different here.
# I think gen has elements it can iter,
# whereas gen_fun is just holding the function
# that has ability to create an iterable object
print(gen_func.__dir__())
print(gen.__dir__())

print(next(gen))
print(next(gen))
print(next(gen))


print("#####################")
# generator version
def fibon(n):
    a = b = 1
    for i in range(n):
        yield a
        a, b = b, a + b

gen = fibon(3)

# Both gen and fibon holds an iterable object
# And hence their __dir__ is exact same.
# fibon().__dir__() is not a valid call. It needs
# fibon(3).__dir__()
print(fibon(3).__dir__())
print(gen.__dir__())

print(next(gen))
print(next(gen))
print(next(gen))