Question

Hi, I am starting the course and was attempting the first assignment. I am stuck on the "Rock, Paper, Scissors" program.

I managed to get the minimum I think they wanted (i.e. it told me who won, and would respond if there was an invalid selection). However, I wanted the program to stop if Player 1 gave anything other than rock, paper, or scissors. I could not figure out how to do that.

I do not have enough room to post my code, but if anyone could share how to do what I described above please do!

Thanks!

Answer 1

p1 = raw_input("Player 1? ")
p1 = p1.lower()
if p1.lower() != 'rock' or\
'paper' or\
'scissors':
print 'That is not a valid object selection'
else:
p2 = raw_input("Player 2? ")
p2 = p2.lower()
if p2.lower() != 'rock' or \
'paper' or \
'scissors':
print 'That is not a valid object selection'


if p1 == 'rock' and\
p2 == 'rock':
print 'The players tie'
elif p1 == 'rock' and\
p2 == 'paper':
print 'Player 2 wins.'
elif p1 == 'rock' and\
p2 == 'scissors':
print 'Player 1 wins.'
elif p1 == 'paper' and\
p2 == 'rock':
print 'Player 1 wins.'
elif p1 == 'paper' and\
p2 == 'paper':
print 'The players tie.'
elif p1 == 'paper' and\
p2 == 'scissors':
print 'Player 2 wins'
elif p1 == 'scissors' and\
p2 == 'rock':
print 'Player 2 wins.'
elif p1 == 'scissors' and\
p2 == 'paper':
print 'Player 1 wins.'
elif p1 == 'scissors' and\
p2 == 'scissors':
print 'The players tie.'

Answer 2

You can use a single regular expression pattern to check for multiple valid values. here's an example:
>>> prog = re.compile('^paper|rock|scissors$',re.IGNORECASE)
>>> prog.search('Rock')==None
False
>>> prog.search('potato')==None
True
>>>