遍历字典

遍历字典：

前置基础知识：

dict.keys() # 字典所有的键
dict.values() # 字典所有的值
dict.items() #  所有的键值对

不同种方式遍历字典：

1. 默认方式为遍历字典的键（key）

temperature_list={"001": 38, "002": 37, "003": 38.5}
for staff in temperature_list:
    temperature = temperature_list[staff]
    if temperature >= 38:
        print(staff)

2. for staff in dict.keys():遍历键

temperature_list={"001": 38, "002": 37, "003": 38.5}
for staff in temperature_list.keys():
    temperature = temperature_list[staff]
    if temperature >= 38:
        print(staff)

3. for staff in dict.iems遍历键值对

temperature_list={"001": 38, "002": 37, "003": 38.5}
for staff in temperature_list.items():
    id = staff[0]
    temperature = staff[1]
    if temperature>=38:
        print(id)

遍历键值对也可以用更简洁的遍历方式：

temperature_list={"001": 38, "002": 37, "003": 38.5}
for staff_id, staff_temperature in temperature_list.items():
    if staff_temperature >= 38:
        print(staff_id)