Python obtains Linux system memory status

[Python] Code

import subprocess
import re
 
keydic = {"MemTotal":"总内存(单位G)",
          "MemFree":"剩余内存(单位G)",
          "MemAvailable":"可用内存(单位G)",
          "Cached":"缓存内存(单位G)"}
 
def command(command):
    p = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
    resultDic = {}
    for line in p.stdout.readlines():
        line = str(line,encoding="utf-8")
        result = re.split("\s*",line)
        if result[0][:-1] in keydic:
            resultDic[keydic[result[0][:-1]]] = "%.2f" %(int(result[1])/(1024**2))
    return resultDic
 
if __name__ == "__main__":
   print(command("cat /proc/meminfo"))