1、实现enumerate函数
def enumerate_generator(iterable):
for i in range(len(iterable)):
yield i,iterable[i]
gen_e = enumerate_generator(['a','b','c','d'])
for e in gen_e:
print(e)
运行结果：
(0, 'a')
(1, 'b')
(2, 'c')
(3, 'd')
2、实现zip函数
def zip_generator(*args):
len_list = []
for i in args:
len_list.append(len(i))
for n in range(min(len_list)):
t = ()
for i in args:
t += (i[n],)
yield t
gen_z = zip_generator([1,2,3,4],('a','b','c','d','e'),['A','B','C'])
for z in gen_z:
print(z)
运行结果：
(1, 'a', 'A')
(2, 'b', 'B')
(3, 'c', 'C')
3、不使用for循环，遍历列表[1,2,3,4,5,6,7,8,9,10]
a_list = [1,2,3,4,5,6,7,8,9,10]
iter_list = a_list.__iter__() #变成迭代器
while True:
try:
res = next(iter_list)
except:
break
else:
print(res)
运行结果：
