# Name: memsize.py
#
# Determines the amount of physical memory in the system by executing the
# command "sysctl -n hw.memsize" using subprocess.check_output,
# taking the result, which is a string that gives the amount of
# memory in bytes, converting the string to an integer, and then
# converting that number to GB.
#
# Created: 2013-10-24
# Version: 0.1

import subprocess

def hwmemsize():
    memory = int(subprocess.check_output(["sysctl", "-n", "hw.memsize"]))
    return memory

print hwmemsize() / 1024 / 1024 / 1024, "GB"