Some things are quick to get going with Python - and there's a lot of python out there for the Raspberry Pi for instance, but node is great at doing other stuff.
Make sure that the python prints something that looks like JSON e.g.
print '{"temperature":',temperature,',"pressure":',pressure,',"humidity":',humidity,'}'
The javascript does some stuff to strip any problematic invisible characters from the string and turns it into JSON, you should then be able to use the JSON output