json dump dumps load loads

#/usr/bin/env python3
import json
print("part1: str -> json")
str1="[1,2,3]"
jl=json.loads(str1)  # list
print(type(jl))
jd=json.dumps(str1)  # str
print(type(jd))


print("
  part2: list -> json")
d=[1,2,3,4,5]
a=json.dumps(d)   # str
print(type(a))
b=json.loads(a)   # list
print(type(b))


print("
  part3: 文件保存")
with open('json.txt','w') as f:
    json.dump(d,f)
    # f.write(json.dumps(d))

with open('json.txt','r') as f:
    a=json.load(f)  # list
    print(type(a))


with open('json.txt', 'r') as f:
    aa=f.read()
    bb=json.loads(aa)  # list
    print(type(bb))