python遍历字典的key python中遍历字典

在Python里，我们把对象称为字典

1、for循环遍历字典, 默认获取的是key

my_dict = {'bookName': 'python', 'price': 100}

for key in my_dict:
    print(key)

# 输出
>> bookName
>> price

2、根据key获取value值

my_dict = {'bookName': 'python', 'price': 100}

for key in my_dict:
    value = my_dict[key]
    print(key, value)

# 输出
>> bookName python
>> price 100

3、遍历字典中的每一个value

my_dict = {'bookName': 'python', 'price': 100}

for key in my_dict.values():
    print(key)

# 输出
>> python
>> 100

4、遍历字典中的每项数据，并且把键值对封装到元祖里面

my_dict = {'bookName': 'python', 'price': 100}

for key in my_dict.items():
    print(key)

# 输出
>> ('bookName', 'python')
>> ('price', 100)

5、利用拆包，使不同的变量保存在容器类型中

my_dict = {'bookName': 'python', 'price': 100}

for key, value in my_dict.items():
	print(key, value)

# 输出
>> bookName python
>> price 100