Random number guessing game - Python

#!/usr/bin/python2.7

'''
Random number guessing game
Created on Jul 19, 2011
@author: giladh
'''

import random # Random number generator
import sys
import csv
import re  #Regular expression module
from itertools import islice

def hscores ():
    hscoresfile="/tmp/scorefile2"
    try:
        hscoresfile
    except:
        with open('/tmp/scorefile2', 'w') as hscores_fh_w:
            pass    #create the scorefile if it doesn't exist

    with open('/tmp/scorefile2', 'rb') as hscores_fh_r:  #open hscores file for reading
        reader = csv.reader(hscores_fh_r) #call csv.reader to parse file
        sorted_scores = (sorted(reader, key=lambda x:float(x[1]) )) #sort numeric by score
        top_ten = list(islice(sorted_scores,10))    #slice off top 10 players

        format = "%-8s %-8s %8s"    #generate print format
        print "The top 10 players are:\n"
        print format % ("RANK","PLAYER","SCORE")
        print format % ("----","------","-----")
        rank = 1
        for row in top_ten:
            name,score = row[0],row[1]
            print format % (rank,name,score)
            rank += 1
        print

#Core game function
def playgame ():
    global player
    randnum = random.randint(0,100)
    print "The random number is:", randnum
    print "\nThis is a random number guessing game...  You are to guess a number between 1-100...\n"
    try:    #Is player defined?
        player
    except: #Get player's name
        player = raw_input("Please enter your name: ")
        print "Hello " + player + ", welcome!\n"
    hscores()

    allguess = []   #Initialize array of player's guesses
    guess = []  #Initialize the 'guess' variable
    while guess != randnum:
        if allguess:
            guess = (raw_input("Enter your next guess: "))
        else:
            guess = (raw_input(player + ", please enter your first guess: "))
        try:
            int(guess)
        except:
            print "Sorry, you must enter a valid integer..."
            continue
        guess = int(guess)  #make sure its a number
        if guess in allguess:
            print "You already guessed that number, please try again..."
            continue
        elif guess < 1 or guess > 100:
            print "Please enter a valid integer between 1 and 100..."
            continue
        allguess.append(guess)  #Add the guess to the array

        if len(allguess) > 1 and guess != randnum:  #Should we calculate warmer/colder?
            prev_gdiff = abs(randnum - allguess[-2])
            curr_gdiff = abs(randnum - allguess[-1])
            if curr_gdiff < prev_gdiff:
                print "you're getting warmer..."
            elif curr_gdiff > prev_gdiff:
                print "you're getting colder..."
            elif curr_gdiff == prev_gdiff:
                print "same difference..."

    num_tries = int(len(allguess))
    print "\n" + player + ", you guessed it in " + str(num_tries) + " tries!"
    print "Your guesses were: " + str(allguess) + "\n"

    #write to scorefile
    with open('/tmp/scorefile2', 'a') as hscores_fh_w:   #open hscores file for append
        writer = csv.writer(hscores_fh_w)
        writer.writerow([player, num_tries])

    repeat()    #See if user wants to play again, call repeat func

#Repeat game function
def repeat ():
    repeat = raw_input("Play Again? (Y/N): ").lower()
    if re.match('y', repeat):
        playgame()
    else:
        print
        hscores()
        print "Thanks for playing " + player + "!"
        sys.exit(0)

#Start the game
playgame()