Is it possible to run function in a subprocess without threading or writing a separate file/script.

import subprocess

def my_function(x):
    return x + 100

output = subprocess.Popen(my_function, 1) #I would like to pass the function object and its arguments
print output 
#desired output: 101

I have only found documentation on opening subprocesses using separate scripts. Does anyone know how to pass function objects or even an easy way to pass function code?