Minecraft server launch python script

minecraftServerLaunch.py

#!/usr/bin/env python

import os
import sys

u_id = 1000
ram = "8"
minimum_ram = "8"
screen_name = "WuShaolinsMinecraftServer"
java_app_name = "spigot-1.13.2"
command = 'screen -dmS ' + screen_name + ' java -Xmx' + ram + 'G -Xms' + minimum_ram + 'G -XX:+UseConcMarkSweepGC -jar ' + java_app_name + '.jar'

try:
    'java --version'
except OSError :
    sys.exit('JAVA is not installed ! Please install it first and then rerun this program')
	
print 'Starting the ' + java_app_name + ' with ' + ram + ' Go RAM'

os.system(command)

print 'Server started in screen named ' + screen_name