#!/usr/bin/env python
 
from collections import OrderedDict
from collections import namedtuple
import os
import glob
import re
 
def cpuinfo():
 
 cpuinfo=OrderedDict()
 procinfo=OrderedDict()
 
 nprocs = 0
 with open('/proc/cpuinfo') as f:
 for line in f:
  if not line.strip():
  
  cpuinfo['proc%s' % nprocs] = procinfo
  nprocs=nprocs+1
  
  procinfo=OrderedDict()
  else:
  if len(line.split(':')) == 2:
   procinfo[line.split(':')[0].strip()] = line.split(':')[1].strip()
  else:
   procinfo[line.split(':')[0].strip()] = ''
  
 return cpuinfo
 
def meminfo():
 
 meminfo=OrderedDict()
 
 with open('/proc/meminfo') as f:
 for line in f:
  meminfo[line.split(':')[0]] = line.split(':')[1].strip()
 return meminfo
 
 
def netdevs():
 
 with open('/proc/net/dev') as f:
 net_dump = f.readlines()
 
 device_data={}
 data = namedtuple('data',['rx','tx'])
 for line in net_dump[2:]:
 line = line.split(':')
 if line[0].strip() != 'lo':
  device_data[line[0].strip()] = data(float(line[1].split()[0])/(1024.0*1024.0), 
      float(line[1].split()[8])/(1024.0*1024.0))
 
 return device_data
 
def process_list():
 
 pids = []
 for subdir in os.listdir('/proc'):
 if subdir.isdigit():
  pids.append(subdir)
 
 return pids
 
 
dev_pattern = ['sd.*','xv*']
 
def size(device):
 nr_sectors = open(device+'/size').read().rstrip('\n')
 sect_size = open(device+'/queue/hw_sector_size').read().rstrip('\n')
 
 return (float(nr_sectors)*float(sect_size))/(1024.0*1024.0*1024.0)
 
def detect_devs():
 for device in glob.glob('/sys/block/*'):
 for pattern in dev_pattern:
  if re.compile(pattern).match(os.path.basename(device)):
  print('Device:: {0}, Size:: {1} GiB'.format(device, size(device)))
 
 
if __name__=='__main__':
 cpuinfo = cpuinfo()
 for processor in cpuinfo.keys():
 print(cpuinfo[processor]['model name'])
 
 meminfo = meminfo()
 print('Total memory: {0}'.format(meminfo['MemTotal']))
 print('Free memory: {0}'.format(meminfo['MemFree']))
 
 netdevs = netdevs()
 for dev in netdevs.keys():
 print('{0}: {1} MiB {2} MiB'.format(dev, netdevs[dev].rx, netdevs[dev].tx))
 
 
 pids = process_list()
 print('Total number of running processes:: {0}'.format(len(pids)))
 
 
 detect_devs()

>>> from collections import namedtuple
>>> data = namedtuple('data',['rx','tx'])
>>> d = data(123,456)
>>> print d
data(rx=123, tx=456)
>>> print d.rx
123