Improvements to the JSON section

Thanks to https://github.com/mplewis
This commit is contained in:
Sam Clift
2015-01-14 15:09:50 +00:00
parent 4db76aac5b
commit f5ee4e207a
+33 -80
View File
@@ -1,33 +1,39 @@
JSON parsing JSON
=========== ===========
json The `json <https://docs.python.org/2/library/json.html>`_ library can read JSON strings into a Python dictionary or array. It can also serialize Python dictionaries or arrays into JSON strings.
-----
`json <https://docs.python.org/2/library/json.html>`_ is a standard libary which can convert JSON to a Dictionay. * There are six basic types in JSON: objects, arrays, numbers, strings, booleans, and null.
* The root element of JSON representation is an object, signified by ``{ ... }``. JSON objects are analogous to Python dictionaries: they have keys which correspond to values.
* JSON does not use single quotes. JSON exclusively uses double quotes. Using single quotes in the place of double quotes is invalid JSON syntax.
For example, a JSON string like this: Parsing JSON
------------
.. code-block:: python The `json <https://docs.python.org/2/library/json.html>`_ libary is imported like this:
"{'first_name':'Guido','last_name':'Rossum'}"
can be loaded like this:
.. code-block:: python .. code-block:: python
import json import json
Take the following string containing JSON data:
.. code-block:: python
json_string = '{"first_name": "Guido", "last_name":"Rossum"}'
It can be manpulated like this:
.. code-block:: python
converted_dict = json.loads(json_string) converted_dict = json.loads(json_string)
you can now use it as a normal dictionary: and can now be used as a normal dictionary:
.. code-block:: python .. code-block:: python
converted_dict['first_name'] converted_dict['first_name']
As well as converting a JSON string to a dictionary. You can convert a dictionary to JSON As well as converting a JSON string to a dictionary. You can convert a dictionary to JSON:
For example, given:
.. code-block:: python .. code-block:: python
@@ -36,25 +42,24 @@ For example, given:
'second_name': 'Rossum' 'second_name': 'Rossum'
} }
import json print(json.dumps(d))
print json.dumps(d)
"{'first_name':'Guido','last_name':'Rossum'}" "{'first_name':'Guido','last_name':'Rossum'}"
It is also possible to import JSON files: We can also load a JSON file by using ``json.load`` instead of ``json.loads``:
.. code-block:: python .. code-block:: python
import json
with file('path/to/file.json') as json_file: with file('path/to/file.json') as json_file:
processed_json = json.load(json_file) processed_json = json.load(json_file)
print processsed_json
print(processsed_json)
{u'first_name': u'Guido', u'last_name': u'Rossum'} {u'first_name': u'Guido', u'last_name': u'Rossum'}
As well as write to them:
Here's an example of writing directly to a file by using ``json.dump`` instead of ``json.dumps``:
.. code-block:: python .. code-block:: python
import json
with file('path/to/file.json', 'w') as json_file: with file('path/to/file.json', 'w') as json_file:
dict = { dict = {
"first_name": "Guido", "first_name": "Guido",
@@ -65,6 +70,9 @@ As well as write to them:
simplejson simplejson
---------- ----------
`simplejson <https://simplejson.readthedocs.org/en/latest/>`_ is the externally maintained development version of the json library.
simplejson mimics the json standard library, so you can start using simplejson instead of json by importing it under a different name
Installation Installation
@@ -72,67 +80,12 @@ Installation
pip install simplejson pip install simplejson
`simplejson <https://simplejson.readthedocs.org/en/latest/>`_ is the externally maintained development version of the json library. Usage
simplejson is updated much more frequently than the Python. Meaning you can get updates much quicker.
For example, a JSON string like this:
.. code-block:: python .. code-block:: python
"{'first_name':'Guido','last_name':'Rossum'}" import simplejson as json
can be loaded like this: simplejson is available so that developers that use an older version of python can use the latest features available in the json lib.
.. code-block:: python
import simplejson
converted_dict = simplejson.loads(json_string)
you can now use it as a normal dictionary:
.. code-block:: python
converted_dict['first_name']
As well as converting a json string to dictionarys. You can convert dictionarys to json
For example, given:
.. code-block:: python
import simplejson
d = {
'first_name': 'Guido',
'second_name': 'Rossum'
}
print simplejson.dumps(d)
"{'first_name':'Guido','last_name':'Rossum'}"
It is also possible to import JSON files:
.. code-block:: python
import simplejson
with file('path/to/file.json') as json_file:
processed_json = simplejson.load(json_file)
print processsed_json
{u'first_name': u'Guido', u'last_name': u'Rossum'}
As well as write to them:
.. code-block:: python
import simplejson
with file('path/to/file.json', 'w') as json_file:
dict = {
"first_name": "Guido",
"last_name": "Rossum",
"middle_name": "Van"
}
simplejson.dump(dict, json_file)