System monitoring with 16x2 LCD screen

system_mon.py

""" System monitoring with a Grove LCD RGB Backlight, connected to
the present machine over I2C
"""
from __future__ import division
# the following library is from https://github.com/youngage/grove-lcd
import display
from smbus import SMBus
import psutil
import time

d = display.Display(SMBus(2))  # Adjust the I2C bus number to your case
block = chr(255)

while True:
    # Get Readings
    cpu = psutil.cpu_percent(interval=0)
    cpublockcount = int(round(cpu / 100 * 8))
    cpublocks = cpublockcount * block + (8-cpublockcount) * " "
    mem = psutil.virtual_memory().percent
    memblockcount = int(round(mem / 100 * 8))
    memblocks = memblockcount * block + (8-memblockcount) * " "

    # Set colours
    r = int(cpu/100.0 * 255)
    b = int(mem/100.0 * 255)
    g = 255 - max(r, b)

    # Display data
    d.color(r, g, b)
    d.move(0, 0)
    d.write("CPU:%3d%%%s" %(cpu, cpublocks))
    d.move(0, 1)
    d.write("MEM:%3d%%%s" %(mem, memblocks))

    time.sleep(0.1)