How to add a condition to JSON list Dictionary based on indexing in python

Question

My Json example

[ {\'key\' : 1, \'value\' : \'one\' } , {\'key\' : 2, \'value\' : \'two\' } , {\'key\' : 3, \'value\' : \'three\' } , {\'key\' : 4, \'value\'