yield 和 yield from

def g2(iter):
	yield from iter

def g1(iter):
	yield iter
 
def out(ar):
    for i in ar:
        print(i)

dit= {
    "a": 1,
    "b": 2,
    "c": 3,
    "d": 4,
    "e": 5,
}

out(g1(dit))
out(g2(dit))
out(g2(g1(dit)))
print(next(g2(g1(dit))))

# 输出如下：
# {'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5}
# a
# b
# c
# d
# e
# {'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5}
# {'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5}