What was the change in the Capitalized software development costs from 2018 to 2019?
{"Computer hardware": {"July 31, 2019 ": 17799, "July 31, 2018": 20614}, "Software": {"July 31, 2019 ": 6741, "July 31, 2018": 4664}, "Capitalized software development costs": {"July 31, 2019 ": 7374, "July 31, 2018": 3978}, "Equipment and machinery": {"July 31, 2019 ": 10455, "July 31, 2018": 4265}, "Furniture and fixtures": {"July 31, 2019 ": 8137, "July 31, 2018": 4217}, "Leasehold improvements": {"July 31, 2019 ": 48191, "July 31, 2018": 10751}, "    Total property and equipment": {"July 31, 2019 ": 98697, "July 31, 2018": 48489}, "Less accumulated depreciation": {"July 31, 2019 ": -32888, "July 31, 2018": -29894}, "    Property and equipment, net ": {"July 31, 2019 ": 65809, "July 31, 2018": 18595}}
capitalized_software_development_costs_2019 = df["Capitalized software development costs"]["July 31, 2019 "]
capitalized_software_development_costs_2018 = df["Capitalized software development costs"]["July 31, 2018"]
answer = capitalized_software_development_costs_2019 - capitalized_software_development_costs_2018