Python - python开发基础(三)迭代器和生成器 - 迁移

# 迭代器和生成器  
from typing import List

l: List[int] = [1, 2, 3]  
# for循环  
"""  
for i in l: # l.__iter__() /l.__iter__.__next__()  
print(i)  
"""

# while循环  
"""  
index = 0  
while index < len(l):  
print(l[index])  
index += 1  
"""

# 用__next__()  
"""  
iter_1 = l.__iter__() # 迭代器协议,生成可迭代对象  
print(iter_1.__next__())  
print(iter_1.__next__())  
print(iter_1.__next__())

"""

# 解析__next__  
"""  
x = 'hello'  
iter_tools = x.__iter__()  
print(iter_tools)  
print(iter_tools.__next__())  
print(iter_tools.__next__())  
print(iter_tools.__next__())  
print(iter_tools.__next__())  
print(iter_tools.__next__())

"""