[Python Wpg] Fw: python problem - help!!

Mon Sep 24 22:49:35 EDT 2007

Hi Chris,
This is what the code would look like if I had used randint() instead
of random():
==========================================================================

# Hockey2.py          Date: 2007/09/24          Author: James S. Crerar

# Two hockey teams play eight times during the regular season. Team A
# wins five times and Team B wins the other three times. They meet in
# the playoffs in a best of seven series. Write a program that estimates
# the chances of Team B winning the series.

# QUESTION:
# Are team B's chances better in a 1 game "series", a 3 game series,
# a 5 game series, or a 7 game series? What would team B's chances of
# winning a 51 game series be?

# ANSWER:
# It looks like the more games in a series the less likely that team B
# will win the series.  (If team A wins 5 out of 8 games during regular
# season).

from random import *

#winA = 5.0/8.0
nsims = 1000
print '\n     CHANCE OF WINNING USING %d SIMULATIONS' % nsims
series = (1,3,5,7,51)
for n in series:
    totalA = 0
    totalB = 0
    nn = 0
    while nn < nsims:
        games = 0
        winsA = 0
        winsB = 0
        while games < n:
            if randint(1,8) <= 5:
                winsA += 1
            else:
                winsB += 1
            games += 1
        if winsA > winsB:
            totalA += 1
        else:
            totalB += 1
        nn += 1
    print '\nFor %d game series:' % games
    chanceA = float(totalA)/nsims * 100
    chanceB = float(totalB)/nsims * 100
    print '     Team A = %5.2f%s     Team B = %5.2f%s' % (
                                chanceA, '\x25', chanceB, '\x25')
raw_input('\n\nCourtesy: James S. Crerar\nPress enter to exit..')

==========================================================================

Thanks,

Jim

  ----- Original Message ----- 
  From: Chris 
  To: 'Jim Crerar' 
  Sent: Monday, September 24, 2007 6:35 PM
  Subject: RE: [Python Wpg] Fw: python problem - help!!

  Thank you for your help.  You are the only help I’ve gotten on this Python stuff…

  Since I am very new at this I am having problem interpreting the code you sent as it is much more advanced than what I work with…what would the code look like if you only used random.randit(), else, if, ect…?  I will understand if you don’t have the time to help me….

  Thank you again.

  Chris

------------------------------------------------------------------------------

  From: winnipeg-bounces at python.org [mailto:winnipeg-bounces at python.org] On Behalf Of Jim Crerar
  Sent: Monday, September 24, 2007 11:36 AM
  To: winnipeg at python.org
  Subject: [Python Wpg] Fw: python problem - help!!

  ----- Original Message ----- 

  From: Jim Crerar 

  To: Chris 

  Sent: Monday, September 24, 2007 12:26 PM

  Subject: Re: [Python Wpg] python problem - help!!

  Hi Chris,

  The following is my version of what you are looking for:

  ==========================================================================

  # Hockey.py          Date: 2007/09/24          Author: James S. Crerar

  # Two hockey teams play eight times during the regular season. Team A
  # wins five times and Team B wins the other three times. They meet in
  # the playoffs in a best of seven series. Write a program that estimates
  # the chances of Team B winning the series.

  # QUESTION:
  # Are team B's chances better in a 1 game "series", a 3 game series,
  # a 5 game series, or a 7 game series? What would team B's chances of
  # winning a 51 game series be?

  # ANSWER:
  # It looks like the more games in a series the less likely that team B
  # will win the series.  (If team A wins 5 out of 8 games during regular

  # season).

  from random import *

  winA = 5.0/8.0
  nsims = 1000
  print '\n     CHANCE OF WINNING USING %d SIMULATIONS' % nsims
  series = (1,3,5,7,51)
  for n in series:
      totalA = 0
      totalB = 0
      nn = 0
      while nn < nsims:
          games = 0
          winsA = 0
          winsB = 0
          while games < n:
              if random() <= winA:
                  winsA += 1
              else:
                  winsB += 1
              games += 1
          if winsA > winsB:
              totalA += 1
          else:
              totalB += 1
          nn += 1
      print '\nFor %d game series:' % games
      chanceA = float(totalA)/nsims * 100
      chanceB = float(totalB)/nsims * 100
      print '     Team A = %5.2f%s     Team B = %5.2f%s' % (
                                  chanceA, '\x25', chanceB, '\x25')
  raw_input('\n\nCourtesy: James S. Crerar\nPress enter to exit..')

  ==========================================================================

  Thanks,

  Jim

  ----- Original Message ----- 

    From: Chris 

    To: winnipeg at python.org 

    Sent: Sunday, September 23, 2007 6:44 PM

    Subject: [Python Wpg] python problem - help!!

    I need your help!

    I have this problem that I can’t seem to figure out.  Can you help?  The problem is listed below, and below it is my code that I have so far.

    ------------------------------------------------------------------------------------------------

    Two hockey teams play eight times during the regular season. Team A wins five times and Team B wins the other three times. They meet in the playoffs in a best of seven series. Write a program that estimates the chances of Team B winning the series. A sample run of the program might look like this:

Are team B's chances better in a 1 game "series", a 3 game series, a 5 game series, or a 7 game series? What would team B's chances of winning a 51 game series be? 

    -----------------------------------------------------------------------------------------------

    import random

    SERIES = 1000

    game = 0

    series = 0

    while series < SERIES:

        teamA = random.randint (1,8)

        teamB = random.randint (1,8)

        teams = teamA + teamB

        if random.randint(1,8) >= 5:

            'Team A' = team

        else:

            'Team B' = team

            game = game + 1

        series = series + 1

    print 'In %2d simulated series %2d won %2d ' % (SERIES,team,game)

    print 'so I estimate there is a',(game / 10.00),'% chance they will win the series.'

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