有个python脚本，我需要先判断当前系统平台是什么，怎么做？windows和linux

import platform

def TestPlatform():
print ("----------Operation System--------------------------")
#Windows will be : (32bit, WindowsPE)
#Linux will be : (32bit, ELF)
print(platform.architecture())

#Windows will be : Windows-XP-5.1.2600-SP3 or Windows-post2008Server-6.1.7600
#Linux will be : Linux-2.6.18-128.el5-i686-with-redhat-5.3-Final
print(platform.platform())

#Windows will be : Windows
#Linux will be : Linux
print(platform.system())

print ("--------------Python Version-------------------------")
#Windows and Linux will be : 3.1.1 or 3.1.3
print(platform.python_version())

def UsePlatform():
sysstr = platform.system()
if(sysstr =="Windows"):
print ("Call Windows tasks")
elif(sysstr == "Linux"):
print ("Call Linux tasks")
else:
print ("Other System tasks")

UsePlatform()