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.
 .
 This package contains the Python 3.x module.