Python if elif not working in my script

Python if elif not working in my script

dummy = 10
x=input("""You use your attack by chossing a attack,for now you have 3
attacks.
Chosse one:
1)punch 3dmg
2)use knife 4dmg
3)use pistol 6dmg
""")
if x == 1:
dummy == 10-3
print"Dummies life:"+str(dummy)
elif x == 2:
dummy == 10-4
print"Dummies life:"+str(dummy)
elif x == 1:
dummy == 10-6
print"Dummies life:"+str(dummy)
if x == 1:
dummy == 10-3
print"Dummies life:"+str(dummy)
elif x == 2:
dummy == 10-4
print"Dummies life:"+str(dummy)
elif x == 1:
dummy == 10-6
print"Dummies life:"+str(dummy)
if x <= 0:
os.system("cls")
elif x >= 0:
x=raw_input("""Attack:
1)punch 3dmg
2)use knife 4dmg
3)use pistol 6dmg
""")
if x == 1:
dummy==dummy-3
elif x==2:
dummy==dummy-4
elif x==2:
dummy=dummy-6
print dummy
It prints dummy is 10 again and the 0 or less isnt working too