JSON tutorial

import dum

# The json module will return something like
data = {
  "title" : "novels",
  "author" :[
    {"name":"Victor Hugo", "book":"Les Misérables", "lang":"fr",},
    {"name":"Mark Twain", "book":"The Adventures of Tom Sawyer", "lang":"en"},
    {"name":"Charles Dickens", "book":"Oliver Twist", "lang":"en"}]}

class Author:
    class dum:
        name = ""
        book = ""
class Library:
    class dum:
        title = ""
        author = [Author]


library =  dum.json(Library, data)
print(library.title)
for auth in library.author:
    print(auth.name, auth.book)

If you run this you get :

novels
Victor Hugo Les Misérables
Mark Twain The Adventures of Tom Sawyer
Charles Dickens Oliver Twist

Using expressions

You can use an xPath like syntax to filter data

class Library:
    class dum:
        enbooks = [str], "/author[@lang=en]/book"

library =  dum.json(Library, data)
for book in library.enbooks:
    print(book)

Then you get :

The Adventures of Tom Sawyer
Oliver Twist