cpuload.py

#!/usr/bin/env python

import time

def get_raw_data():
    with open("/proc/stat") as s_fd:
        data = [l.strip().split() for l in s_fd if l.startswith("cpu")]
    data = {e[0]: [int(x) for x in e[1:]] for e in data}
    return data

def calculate_usage(t):
    fst = get_raw_data()
    time.sleep(t)
    snd = get_raw_data()
    data = {k: [x[1] - x[0] for x in zip(fst[k], snd[k])] for k in fst}
    def calc_pers(d):
        pers = 100 - (d[3] * 100.00 / sum(d))
        return pers
    data = {k: calc_pers(data[k]) for k in data}
    return data

if __name__ == "__main__":
    data = calculate_usage(2)
    print("\n".join(sorted("%s: %.2f%%" % (k, data[k]) for k in data)))