Data can be stored in files on your computer.
You can have your Processing program write the data to a file.
Then you can have your python program read that file to obtain that data.
This can also work in reverse.

Why would you want to write what is essentially one "program" in two different languages, however?

i am planning to develop a interactive program and this program is about photos with cartoon caracter. first program which i programmed with processing is going to take photo of user with character than processing will send this file to python and python is going to upload this photo on the web. (by the way i am new about web programming and developing project with more than 1 programming program. my friend told me  maybe i can create this web uploading thing with python because of that i started the learn python if you know better solution please give me an advise for that project)

Search for the postToWeb library.