how kivy python module knows where does kv files lie to tell where to pick kv files from specific location?

I have just started to learn Kivy, and when I tried with pure python way and then defining label in Kv file, It picked up file if it is only named same as class, also it looks in the same folder where py module of kivy is lying how can I specify a different folder to look in my python module so i can organise the structure of modules and kv files ?