python 字符串和字典互转，以及 python对象存入到文件，且读取

########dumps()和loads()   字典和字符串的相互转化
import json
dict = {1:"a",2:"b",3:"c"}
print(dict)
str_dict = json.dumps(dict)
print(str_dict)
print(type(str_dict))
dict = json.loads(str_dict)
print(type(dict))
print(dict)




#####dump() 和 load()   python对象存入文件并读取
a = [1,3,4,5,6,7,8,9]
with open('a.txt', 'w') as f:
    json.dump(a, f)


# Reading data back
with open('a.txt', 'r') as f:
    a = json.load(f)
print(a)