Python Easy Examples help

[blankanon]

So I was reading some examples and trying to get them to work but nothing happens.

Code: [Select]

>>> # Fibonacci series:
>>> # the sum of two elements defines the next
>>> a, b = 0, 1
>>> while b < 10:
         print b,
         a, b = b, a+b

What do I do to get Python to execute this?

[Kulverstukas]

Mind the indentation. In Python code indentation is compulsory. So after each for/if/while etc. you have to put 4 spaces

Code: [Select]

>>> a, b = (0,  1)
>>> while b < 10:
...     print b
...     a,  b = (b, a+b)
...
1
1
2
3
5
8


I recommend you to read http://www.python.org/dev/peps/pep-0008/
it is a really good paper about code style in Python

[blankanon]

Thanks.  I followed your example and nothing happened as well.  How do I get Python to execute the code?  I went to debugger and that did nothing as well.


Also, can you explain this line a, b = (b, a+b)?

[ande]

Thanks.  I followed your example and nothing happened as well.  How do I get Python to execute the code?

You run python FILENAME/PATH in cmd or terminal.

Also, can you explain this line a, b = (b, a+b)?

I dont really know python that well, but I believe its the same as setting a and b to 1 because a = 0 and b = 1.

[Kulverstukas]

You run python FILENAME/PATH in cmd or terminal.

Not necessarily. 5 lines of code can be executed in an interactive Python shell as well. Don't forget to press Enter again to finish the FOR loop and execute the loop.
If you want, you can run it from a file too. Just save the code in a file and then do: python script.py

I dont really know python that well, but I believe its the same as setting a and b to 1 because a = 0 and b = 1.

You are correct. It is the same thing, although when closed with ( and ) it is counted as a Tuple and as a group of variables. I just find it more clean to do it that way

[blankanon]

I had to hit return twice.  Thanks.

[blankanon]

Rock, Paper, Scissors game:

Code: [Select]

player1 = raw_input ("Player 1? ") # player 1's move
player2 = raw_input ("Player 2? ") # player 2's move


if (player1 == 'rock' and player2 == 'scissors'):
    print 'Player 1 wins!'


elif (player1 == 'rock' and player2 == 'paper'):
    print 'Player 2 wins!'


elif (player1 == 'scissors' and player2 == 'rock'):
    print 'Player 2 wins!'


elif (player1 == 'scissors' and player2 == 'paper'):
    print 'Player 1 wins!'


elif (player1 == 'paper' and player2 == 'scissors'):
    print 'Player 2 wins!'


elif (player1 == 'paper' and player2 == 'rock'):
    print 'Player 1 wins!'


elif (player1 == player2):
    print 'Tie.'


How can I make this start over if there is a tie? 
How can I make this not care if there are capital letters inputted?


Thanks.
   

[xzid]

^
I won't give you code, this is nice learning project. But can give you some advice.

Perhaps shorten input in this style:

(R)ock, (P)aper, (S)cissors

In pseudocode, C-stylish code(not really any code):

Code: [Select]

p1win = "player 1 wins!"
p2win = "player 2 wins!"
retry = true

while(retry)
  {
  retry = false
  p1 = getinput()
  p2 = getinput()

  if(p1 == "R")
    {
    if(p2 == "S") print p1win
    elif(p2 == "P") print p2win
    else retry = true
    }
  else if(p1 == "P")
    {
    # etc.. finish the code
    }
  else
    {

    }
  }

There are better ways to do it, kept it simple. goto would be best, but ppl don't like it.

About capital letters:
  http://docs.python.org/library/stdtypes.html

scroll down to str.upper(), and take a peek at other functions described here.

[blankanon]

So here is what I tried and I was told rock isn't defined line 9

Code: [Select]

p1win = "Player 1 wins!"
p2win = "Player 2 wins!"
player1 = raw_input ("Player 1? ") # player 1's move
player2 = raw_input ("Player 2? ") # player 2's move
retry = True


while (retry):
    retry = False
    if player1 == rock:
          if player2 == scissors:
              print p1win
          elif player2 == paper:
              print p2win
          elif player2 == rock:
              print "Tie"
              retry = True
    elif player1 == scissors:
          if player2 == rock:
              print p2win
          elif player2 == paper:
              print p1win
          elif player2 == scissors:
              print "Tie"
              retry = True
    elif player1 == paper:
          if player2 == rock:
              print p1win
          elif player2 == scissors:
              print p2win
          elif player2 == paper:
              print "Tie"
              retry = True


[xzid]

don't forget the quotes, they aren't variables only strings.

[blankanon]

Thanks put the quotes in, but if there is a tie, the output is an infinite loop of ties.

[xzid]

My error, never tested any code.. Input should come from within loop.

[blankanon]

So how can I get it to print "Tie" once and then re-start the game?

[xzid]

So how can I get it to print "Tie" once and then re-start the game?

Once again didn't test anything.. But in theory just move lines:

player1 = raw_input ("Player 1? ") # player 1's move
player2 = raw_input ("Player 2? ") # player 2's move

right after:

while (retry):
    retry = False

inside your loop, so if loops again will take new input

[blankanon]

That was it thanks.