Find total memory, free memory

#!/usr/bin/python3
from collections import OrderedDict

f = open('/proc/meminfo')
r = f.read().splitlines()
meminfo = OrderedDict()
for i in r:
    meminfo[i.split(':')[0]] = i.split(':')[1]

memt = int(meminfo['MemTotal'].rstrip('kB'))/1024/1024
memf = int(meminfo['MemFree'].rstrip('kB'))/1024
memc = int(meminfo['Cached'].rstrip('kB'))/1024
memb = int(meminfo['Buffers'].rstrip('kB'))/1024
print('Total Memory: {:2.1f} GB'.format(memt) )
print('Free Memory: {:4.1f} GB'.format(int(memf + memc + memb)/1024))