6-2 how to read and write JSON data

By looking at Help (json.dump) and assist information (json.dumps), dump is converting the format to a file object, and dumps converts the format to a string.

First,Json.dumps ()

Json.dumps () Converts the Python object to JSON format.

1.Convert list toJSON format,

>>> L = [up,'abc', {'name':'Bob ' age': []]>>> json.dumps (l)'  [1, 2, "abc", {"Age": +, "name": "Bob"}]'

2. Convert Dictionary to JSON

>>> d = {'b': None,'a': 5,'c' :'abc'}>>> json.dumps (d)'{"A ": 5," C ":" abc "," B ": null}'

The conversion is basically the same as before the conversion, but the none of Python is converted to JSON null

Json.dumps () is converted to JSON after separating defaults think ', ' or ': ' (comma or colon spaces). You can specify the delimiter by separators, remove the space, the space as the display of some good-looking, do the transmission of more transmission.

>>> json.dumps (l,separators=[',',':']) ' ["abc", {"Age": +, "name": "Bob"}] '

sort the conversion results using the sort_keys parameter

>>> json.dumps (d,sort_keys=True)'{' A ': 5, ' B ': null, ' C ': ' abc '}' 

Twowill beJSON formatted data to Python object

Two functions for load () and loads ()

>>> D2 = json.loads ('{"A": 5, "C": "abc", "B": null}')>>> d2{ U 'a': 5, u'C': U'ABC' , u'b': None}

threeDump and load operations on files

>>> with open (R"C + + video \python Efficient Practice tips Note \6 data encoding and processing related topics \jsondemo.txt",' WB ' ) as F:    Json.dump (L, F)    Json.dump (d, F)

>>> with open (R"C + + video \python Efficient Practice tips Note \6 data encoding and processing related topics \jsondemo2.txt",'  w') as F:    Json.dump (L, F)    Json.dump (d, F)

6-2 how to read and write JSON data