JSON dumps

• dumps

• Dictionaries and lists are handles

• Tuples are indistinguishable from lists

• Always Double-quotes

• null instead of None

• No trailing comma

import json

data = {
  "fname" : 'Foo',
  "lname" : 'Bar',
  "email" : None,
  "children" : [
     "Moo",
     "Koo",
     "Roo",
  ],
  "fixed": ("a", "b"),
}
print(data)

json_str = json.dumps(data)
print(json_str)

with open('data.json', 'w') as fh:
    fh.write(json_str)

{'fname': 'Foo', 'lname': 'Bar', 'email': None, 'children': ['Moo', 'Koo', 'Roo'], 'fixed': ('a', 'b')}
{"fname": "Foo", "lname": "Bar", "email": null, "children": ["Moo", "Koo", "Roo"], "fixed": ["a", "b"]}

dumps can be used to take a Python data structure and generate a string in JSON format. That string can then be saved in a file, inserted in a database, or sent over the wire.