system_info.py

# http://cagewebdev.com/raspberry-pi-showing-some-system-info-with-a-python-script/
import subprocess
import os
def get_ram():
# Returns a tuple (total ram, available ram) in megabytes. See www.linuxatemyram.com
    try:
        s = (subprocess.check_output(['free','-m'])).decode()
        lines = s.split('\n')
        return int(lines[1].split()[1]), int(lines[2].split()[3])
    except:
        return 0

def get_process_count():
# Returns the number of processes
    try:
        s = (subprocess.check_output(['ps','-e'])).decode()
        return len(s.split('\n'))
    except:
        return 0

def get_up_stats():
# Returns a tuple (uptime, 5 min load average)
    try:
        s = (subprocess.check_output(['uptime'])).decode()
        load_split = s.split('load average: ')
        load_five = float(load_split[1].split(',')[1])
        up = load_split[0]
        up_pos = up.rfind(',',0,len(up)-4)
        up = up[:up_pos].split('up ')[1]
        return ( up , load_five )
    except:
        return '' , 0

def get_connections():
# Returns the number of network connections
    try:
        s = (subprocess.check_output(['netstat','-tun'])).decode()
        return len([x for x in s.split() if x == 'ESTABLISHED'])
    except:
        return 0

def get_temperature():
# Returns the temperature in degrees C
    try:
        s = (subprocess.check_output(['/opt/vc/bin/vcgencmd','measure_temp'])).decode()
        return float(s.split('=')[1][:-3])
    except:
        return 0

def get_ipaddress():
# Returns the current IP address
    arg='ip route list'
    p=subprocess.Popen(arg,shell=True,stdout=subprocess.PIPE)
    data = p.communicate()
    split_data = data[0].split()
    ipaddr = (split_data[split_data.index(b'src')+1]).decode()
    return ipaddr

def get_cpu_speed():
# Returns the current CPU speed
    f = os.popen('/opt/vc/bin/vcgencmd get_config arm_freq')
    cpu = f.read()
    return cpu

print('Free RAM: '+str(get_ram()[1])+' ('+str(get_ram()[0])+')')
print('Number of processes: '+str(get_process_count()))
print('Up time: '+get_up_stats()[0])
print('Number of connections: '+str(get_connections()))
print('Temperature in C: ' +str(get_temperature()))
print('IP-address: '+get_ipaddress())
print('CPU speed in MHz: '+str(get_cpu_speed()))