关于生成器和yield的执行过程

# 这是列表推导式
list1 = [x for x in range(10)]
print(list1)

g = (x*3 for x in range(10))
print(type(g)  # <class 'generator'> 得到的类型是生成器
print(g)
#<generator object <genexpr> at 0x000001DF35D5BDD0>

print(g.__next__())  # 0
print(g.__next__())  # 3
print(g.__next__())  # 6

print(next(g))  #9

def func():
    n = 0
    while True:
        n += 1
        yield n  # yield 相当于将n返回给g + 暂停
g = func()
print(g.__next__())
>>>1

def fib(length):
    a = 0
    b = 1
    n = 0
    while n < length:
        a, b = b, a + b
        yield b
        n += 1  # 下一次调用从此处开始执行
    return "超过次数！"
    # 会返回给报错原因stop iteration中 （StopIteration: 超过次数！）


result = fib(8)
print(result.__next__())
print(result.__next__())
print(result.__next__())
print(result.__next__())
print(result.__next__())

# 调用超过length的次数将会报错
打印结果：
1
2
3
5
8

#这是原代码
def foo():
    n = 0
    while True:
        temp = yield n
        print("temp", temp)
        n += 1
# 调用
f = foo()
foo1 = f.send(None)
print("foo1:", foo1)
foo2 = f.send("foo2") #send函数相当于给yield传值
print("foo2:", foo2)

最后的结果：
foo1: 0
temp foo2
foo2: 1