生成器

# 函数形式

def fun():
    for i in range(10):
        yield i

res = fun()
print(res.__next__())
print(res.__next__())
print(res.__next__())
print(res.__next__())
print(next(res))
print(next(res))

# (三元表达式)

res = (i for i in range(10))
print(res.__next__())
print(res.__next__())
print(res.__next__())
print(res.__next__())
print(next(res))
print(next(res))