Example of communication between OBS scripts/plugins.

examplelib.py

# State of this module actually persists between script deletions.
# I think it's loaded the first time it's imported, 
# and is kept until OBS shutdown or until OBS somehow deinitializes python.
# You'll probably have to reload this module to reset its state.
# https://stackoverflow.com/questions/437589/how-do-i-unload-reload-a-python-module

globalcount = 0

def print_global(who):
	print(who, globalcount)

def add_to_global(who, count):
	global globalcount
	print(who)
	globalcount += count

script1.py

import obspython as obs
import examplelib

def print_val(props, prop):
    examplelib.print_global("script1")

def add_val(props, prop):
    examplelib.add_to_global("script1", 2)

def script_properties():
    props = obs.obs_properties_create()
    obs.obs_properties_add_button(props, "printbtn", "print", print_val)
    obs.obs_properties_add_button(props, "addbtn", "add 2", add_val)
    return props

script2.py

import obspython as obs
import examplelib

def print_val(props, prop):
    examplelib.print_global("script2")

def add_val(props, prop):
    examplelib.add_to_global("script2", 3)

def script_properties():
    props = obs.obs_properties_create()
    obs.obs_properties_add_button(props, "printbtn", "print", print_val)
    obs.obs_properties_add_button(props, "addbtn", "add 3", add_val)
    return props