Gambling Script Help

[Mr.FeellingLeSS]

guys i got an other problem

Code:

import os
import platform
systemver=platform.release()
if systemver=='XP':
    clearer=os.system("cls")
elif systemver=='Vista':
    clearer==os.system("clear")
else:
    clearer==os.system("clear")
clearer
print "TEST TEXT"
clearer
print "TEST LTEXT"
raw_input("")

it won't clear, though i don't get a error...
it just skips clearer like it means nothing...