python - Answered Calculator -

i've looked around people have done haven't been getting results. following formula off website (here link) http://www.serebii.net/games/damage.shtml . using python 3+ here code. (note have left out random number) keep getting syntax error.

level = int(input('please enter pokemons level :' )) attackstat= int(input('please enter pokemons special/attack stat : ')) defensestat= int(input('please enter opponents special/defense stat : ')) attackpower= int(input('please enter moves base attack : ')) answer= str('is move stab? : ') stab= if answer == yes:                       stab= 1.5 else:           stab= 1 answer1= int('how effective move?') resistance= if answer1== 4:                            resistance= 4             if answer1== 2:                            resistance= 2             if answer1== 1:                            resistance= 1             if answer1== 0.5:                              resistance= 0.5             if answer1== 0.25:                               resistance= 0.25 damage= (((2* level/5 +2) * attackstat * attackpower/ defensestat)/50)+2)*stab*resistance/100 print (damage) 

well:

resistance= if answer1== 4:                            resistance= 4             if answer1== 2:                            resistance= 2             if answer1== 1:                            resistance= 1             if answer1== 0.5:                              resistance= 0.5             if answer1== 0.25:                               resistance= 0.25 

give error in python. write:

if answer1== 4:     resistance= 4 if answer1== 2:     resistance= 2 if answer1== 1:     resistance= 1 if answer1== 0.5:     resistance= 0.5 if answer1== 0.25:     resistance= 0.25 

and better:

if answer1== 4:     resistance= 4 elif answer1== 2:     resistance= 2 elif answer1== 1:     resistance= 1 elif answer1== 0.5:     resistance= 0.5 elif answer1== 0.25:     resistance= 0.25 

and (same):

stab= if answer == yes:                       stab= 1.5  if answer == "yes":     stab = 1.5 else:     stab = 1 

and better

resistance = answer1 

or

if answer1 in [4, 2, 1, 0.5, 0.25]:     resistance = answer1