在 python 中组合 json 字符串时出现语法错误

Question

I have to create a json string with combined sub string. i coded as below

import json

s1 = {'name':'s1','age':15}
s2 = {'name':'s2','age':10}
s3 = {'name':'s3','age':12}
s = {'class':1}

master = {s,'students':[s1,s2,s3]}
print(master)

i got syntax error in line

master = {s,'students':[s1,s2,s3]}

I like to get out as follows

{'class':1,'students':[{'name':'s1','age':15},{'name':'s2','age':10},{'name':'s3','age':12}]}

Kindly help. I am newbie in python

Answer 1

Try:

master = {**s,'students':[s1,s2,s3]}

This will expand s into its keys and values so that they are directly part of master . Otherwise you have to specify keys and values directly with : between.

Note that this only works in Python 3.

Answer 2

Try this one, it working in Python2:

import json

s1 = {'name':'s1','age':15}
s2 = {'name':'s2','age':10}
s3 = {'name':'s3','age':12}
s = {'class':1}
students = {'students':[s1,s2,s3]}

master = dict(s.items() + students.items())
print(master)

And this will working for python2 and python3

master = dict(list(s.items()) + list(students.items()))

Answer 3

One more way to achieve this

s1 = {'name':'s1','age':15}
s2 = {'name':'s2','age':10}
s3 = {'name':'s3','age':12}
s = {'class':1}

master = {}
master.update(s)
master.update({'students':[s1,s2,s3]})

This should work with both the python versions

Answer 4

master = {**s,'students':[s1,s2,s3]}