#字典转换成json字符串 
json.dumps(dict)

# 创建字典
info_dict = {'name': 'Joe', 'age': 20, 'job': 'driver'}
# dumps 将数据转换成字符串
info_json = json.dumps(info_dict,sort_keys=False, indent=4, separators=(',', ': '))
# 显示数据类型
print(type(info_json))
f = open('info.json', 'w')
f.write(info_json)

#json字符串转换成字典
json.loads(json_str)

In [25]: j 
Out[25]: '{"name": "mary", "age": 21}' 
In [26]: result = json.loads(j) 
In [27]: result 
Out[27]: {'name': 'mary', 'age': 21} 
In [28]: type(result) 
Out[28]: dict

import json
"""
dumps:将python中的字典转换为字符串
output:
{'fontFamily': '微软雅黑', 'fontSize': 12, 'BaseSettings': {'font': 1, 'size': {'length': 40, 'wigth': 30}}}
{"fontFamily": "\u5fae\u8f6f\u96c5\u9ed1", "fontSize": 12, "BaseSettings": {"font": 1, "size": {"length": 40, "wigth": 30}}}
"""
def json_dumps():
json_dict = {'fontFamily': '微软雅黑', 'fontSize': 12, 'BaseSettings': {'font': 1, 'size': {'length': 40, 'wigth': 30}}}
print(type(json_dict))
print(json_dict)
json_str = json.dumps(json_dict)
print(type(json_str))
print(json_str)
"""
dump:将数据写入json文件中
"""
def json_dump():
json_dict = {'fontFamily': '微软雅黑', 'fontSize': 12, 'BaseSettings': {'font': 1, 'size': {'length': 40, 'wigth': 30}}}
with open("../file/record.json", "w")as f:
json.dump(json_dict, f)
print("finished")
"""
loads:将字符串转换为字典
output:
{"fontFamily": "微软雅黑", "fontSize": 12, "BaseSettings": {"font": 1, "size": {"length": 40, "wigth": 30}}}
{'fontFamily': '微软雅黑', 'fontSize': 12, 'BaseSettings': {'font': 1, 'size': {'length': 40, 'wigth': 30}}}
"""
def json_loads():
json_str = '{"fontFamily": "\u5fae\u8f6f\u96c5\u9ed1", "fontSize": 12, "BaseSettings": {"font": 1, "size": {"length": 40, "wigth": 30}}}'
print(type(json_str))
print(json_str)
json_dict = json.loads(json_str)
print(type(json_dict))
print(json_dict)
"""
load:读文件，并把字符串变换为Python数据类型
output:
40
{'fontFamily': '微软雅黑', 'fontSize': 12, 'BaseSettings': {'font': 1, 'size': {'length': 40, 'wigth': 30}}}
"""
def json_load():
f = open("../file/record.json", encoding='utf-8')
setting = json.load(f)
print(setting['BaseSettings']['size']['length'])
setting['BaseSettings']['size']['length'] = 40
print(setting)
if __name__ == '__main__':
json_dumps()
json_dump()
json_loads()
json_load()