python自动安装python2.7

#coding = utf-8
import os
import sys
if(os.getuid() == 0):
	pass
else:
	print ("you are not root user")
	sys.exit(1)

#version = input("please input python version	(2.7/3.6)")
version = 2.7
if version == 2.7:
	packagename = "Python-2.7.13"
else:
	packagename = "Python-3.6.2"
os.system("rm -rf "+ packagename+"*")

if(version == 2.7):
	url = "https://www.python.org/ftp/python/2.7.13/Python-2.7.13.tgz"
elif version == 3.6:
	url = "https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tgz"
else:
	print("input error")
	sys.exit(1)

cmd = "wget " + url
res = os.system(cmd)

if res != 0:
	print("download failed check network")

cmd = "tar xvf " + packagename +".tgz"

res = os.system(cmd)

if res != 0 :
	print("tar failed")
	os.system("rm " + packagename + ".tgz")
	sys.exit(1)

cmd = "cd Python-2.7.13 && ./configure --prefix=/usr/local/python2.7 && make && make install"
res = os.system(cmd)

if res != 0 :
	os.system("rm -rf "+ packagename)
	os.system("rm " + packagename + ".tgz")
	print("make failed")
	sys.exit(1)