python dict 与json的运用

在json模块有2个方法，

• loads()：将json数据转化成dict数据
• dumps()：将dict数据转化成json数据
• load()：读取json文件数据，转成dict数据
• dump()：将dict数据转化成json数据后写入json文件

import json

# a是字典dict
a = {"a": 1, "b": 2, "c": True}

# b是json
b = '{"a": 1, "b": 2, "c": true}'

print(type(a))  #dict
c=json.dumps(a)
print(type(c))   # a转json  a的类型是str

# dict字典转json数据
def dict_to_json():
    dict = {}
    dict['name'] = 'eden'
    dict['age'] = 20
    dict['sex'] = 'female'
    # print(dict)  # 输出：{'name': 'eden', 'age': 20, 'sex': 'female'}
    j = json.dumps(dict)
    print(j)  # 输出：{"name": "eden", "age": 20, "sex": "female"}

# json数据转成dict字典
def json_to_dict():
    j = '{"name": "eden", "age": 20, "sex": "female"}'

    dict = json.loads(s=j)
    print(dict)

def dict_to_json_write_file():
    dict = {}
    dict['name'] = 'eden'
    dict['age'] = 20
    dict['sex'] = 'female'
    print(dict)  #{"name": "eden", "age": 20, "sex": "female"}

    with open('1.json', 'w') as f:
        json.dump(dict, f)  # 会在目录下生成一个1.json的文件，文件内容是dict数据转成的json数据

def json_file_to_dict():
    with open('1.json', 'r') as f:
        dict = json.load(f)
        print(dict)  #{"name": "eden", "age": 20, "sex": "female"}