元组、列表、字典和集合，都是可迭代对象，可以通过 for 循环依次读取元素：
元组依次取得元素：
students:tuple[str, str, str] = ("Tom", "Jerry", "Spike")
for student in students:
print(student)
列表依次取得元素：
students:list[str] = ["Tom", "Jerry", "Spike"]
for student in students:
print(student)
字典依次取得 索引：
score_list:dict[str,int] = {
'Tom': 88,
'Jerry': 99,
'Spike': 66
}
for key in score_list:
print(key, score_list[key])
元组依次取得元素：
fruits:set[str] = {'Apple', 'Orange', 'Strawberry', 'Banana', 'Pineapple'}
for fruit in fruits:
print(fruit)
字符串也是可迭代对象，依次取得字符：
text:str = "hello world"
for word in text:
print(word)