Extensions for JSONPath RW
Project description
Extensions for JSONPath RW
jsonpath-rw-ext extends json-path-rw capabilities by adding multiple extensions. ‘len’ that allows one to get the length of a list. ‘sorted’ that returns a sorted version of a list, ‘arithmetic’ that permits one to make math operation between elements and ‘filter’ to select only certain elements of a list.
Each extensions will be proposed upstream and will stay here only if they are refused.
Free software: Apache license
Documentation: https://python-jsonpath-rw-ext.readthedocs.org/en/latest/
Quick Start
At the command line:
$ pip install jsonpath-rw-ext
Or, if you have virtualenvwrapper installed:
$ mkvirtualenv jsonpath-rw-ext $ pip install jsonpath-rw-ext
To replace the jsonpath_rw parser by this one with:
import jsonpath_rw_ext
jsonpath_rw_ext.parse("$.foo").find(...)
Or:
from jsonpath_rw_ext import parser
parser.ExtentedJsonPathParser().parse("$.foo").find(...)
The jsonpath classes are not part of the public API, because the name/structure can change when they will be implemented upstream. Only the syntax shouldn’t change.
Extensions
name |
Example |
|---|---|
len |
|
sub |
|
split |
|
sorted |
|
filter |
|
arithmetic (-+*/) |
|
About arithmetic and string
Operations are done with python operators and allows types that python allows, and return [] if the operation can be done due to incompatible types.
When operators are used, a jsonpath must be be fully defined otherwise jsonpath-rw-ext can’t known if the expression is a string or a jsonpath field, in this case it will choice string as type.
Example with data:
{
'cow': 'foo',
'fish': 'bar'
}
About arithmetic and list
Arithmetic can be used against two lists if they have the same size.
Example with data:
{'objects': [
{'cow': 2, 'cat': 3},
{'cow': 4, 'cat': 6}
]}
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