正確理解python迭代器與生成器

L = [1,2,3,4]
it = iter(L)    #創(chuàng)建迭代器對象
print(next(it)) #輸出迭代器的寫一個對象
print(next(it))

li = [5,6,7,8]
it = iter(li)
for x in it: 
    print(x,end = ' ')

lis = [7,8,9,0]
it = iter(lis)
while True:
    try:
        print(next(it))
    except StopIteration:
        break

def fun(n):
    a,b,c = 0,1,0
    while cn:
        print(b)    # 打印菲波那切數(shù)列
        a,b = b,a+b
        c +=1

fun(10)

def fun(n):
    a,b,c = 0,1,0
    while cn:
        yield b     # 生成器
        a,b = b,a+b
        c +=1

# print(fun(10))# generator object fun at 0x000001ED43A48A40>
t = fun(10)    # t是一個迭代器，由生成器返回生成
print(next(t))  # 1
print(next(t))  # 1
print("中間可以插入代碼")  # 中間可以插入代碼
print(next(t))  # 2
print(next(t))  # 3

for i in t:
    print(i)
# 8
# 13
# 21
# 34
# 55

gen = (x**2 for x in range(1, 4))
it = iter(gen)  # 轉(zhuǎn)成生成器
next(it)　　# 1
next(it)　　# 4
next(it)　　# 9
next(it)　　# StopIteration

numbers = [10086,10000,10010,95586]
names = ['中國移動','中國聯(lián)通','中國電信']
for t in zip(numbers,names):
    print(t)

#(10086, '中國移動')
#(10000, '中國聯(lián)通')
#(10010, '中國電信')

def myzip(iter1,iter2):
    it1 = iter(iter1)   # 拿出一個迭代器
    it2 = iter(iter2)
    while True:
        a = next(it1)
        b = next(it2)
        yield (a,b)

numbers = [10086,10000,10010,95586]
names = ['中國移動','中國聯(lián)通','中國電信']
for t in myzip(numbers,names):
    print(t)
# (10086, '中國移動')
# (10000, '中國聯(lián)通')
# (10010, '中國電信')

names = ['中國移動', '中國電信', '中國聯(lián)通']
for x in enumerate(names):  #生成迭代器
    print(x)
def myenumerate(iterable):
    it = iter(iterable)
    i = 0
    while True:
        a = next(it)
        yield(i,a)
        i += 1
#(0, '中國移動')
#(1, '中國電信')
#(2, '中國聯(lián)通')