Hi Tutor,
The previous elements I sent to the mailing list were incomplete and needs no
answer from Tutor.
To clarify and re-phrase my script issue:
I want to code a game whereby the computer guesses either by luck or deduction
a number I pick within [0, 100].
In attached machine_guess_number.py in which line 22 statement number =
random.randint(low_range + 1, high_range - 1) doesn't narrow the range:
- to allow number deduction...
- ... avoiding ValueError: empty range for randrange()
I also attached the output of the script leading to the error showing that the
loop does not exit in time to avoid error by working out the answer based on a
logical narrowing of the guessing range.
Hope this clarifies my previous email (see further down this note).
Thanks,
Marc
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> Date: Sat, 15 Feb 2014 17:26:41 +0100
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From: marc_eym...@hotmail.com
To: tutor@python.org
Subject: Beginner - understanding randint arguments
Date: Sat, 15 Feb 2014 16:25:34 +0000
Hello Tutor,
I need to generate a random integer between 0 and 100.
The range is supposed to be adjusted by my two variables:
low_range and high_range.
The
logic of using the variables as part of the function arguments is to
manage to get a smaller range each time the function is called excluding the
possible repeat of the return value of randint.
Here is what happens in my script:
>>> import random
>>> low_range = -1
>>> high_range = 101
>>> random.randint(low_range + 1, high_range - 1)
56
>>> low_range
-1
>>> high_range
101
I was rather expecting:
>>> low_range
0
>>> high_range
100
Can somebody explain why both low_range and high_range are still returning
their initial values ?
Thanks,
Marc
#Guess my Number game
#The computer has to guess the player's number by either luck or deduction
#number has to be within [0, 100]
import random
print('Pick a number between and 0 and 100...')
print('...and let me try to guess in as few attempts as possible.\n')
input('Press ENTER when ready to play.\n')
# set variables
clue = ''
count_guess = 0
low_range = -1
high_range = 101
while clue != 'correct' and low_range != high_range:
number = random.randint(low_range + 1, high_range - 1)
count_guess += 1
print('\nIs your number', number, end= '? ')
clue = input('\n\nEnter one of the following clues:\n\n' \
+ '\t\thigher\n'
+ '\t\tlower\n'
+ '\t\tcorrect\n\n'
+ 'Type here and press ENTER: ')
if clue == 'lower':
high_range = number
elif clue == 'higher':
low_range = number
elif clue == 'correct':
if count_guess > 1:
print('\nYou picked', number,'and it took me only', count_guess, 'attempts to find out.')
else: print('\nI could read your mind at once and saw you picked', number)
if low_range == high_range:
print('\nYou picked', number,'and it took me only', count_guess, 'attempts to find out.')
Python 3.3.2+ (default, Oct 9 2013, 14:50:09)
[GCC 4.8.1] on linux
Type "copyright", "credits" or "license()" for more information.
>>> ================================ RESTART ================================
>>>
Pick a number between and 0 and 100...
...and let me try to guess in as few attempts as possible.
Press ENTER when ready to play.
Is your number 92?
Enter one of the following clues:
higher
lower
correct
Type here and press ENTER: higher
Is your number 93?
Enter one of the following clues:
higher
lower
correct
Type here and press ENTER: higher
Is your number 97?
Enter one of the following clues:
higher
lower
correct
Type here and press ENTER: lower
Is your number 95?
Enter one of the following clues:
higher
lower
correct
Type here and press ENTER: higher
Is your number 96?
Enter one of the following clues:
higher
lower
correct
Type here and press ENTER: lower
Traceback (most recent call last):
File "/home/marc/Ubuntu One/Python/machine_guess_number.py", line 22, in <module>
number = random.randint(low_range + 1, high_range - 1)
File "/usr/lib/python3.3/random.py", line 214, in randint
return self.randrange(a, b+1)
File "/usr/lib/python3.3/random.py", line 192, in randrange
raise ValueError("empty range for randrange() (%d,%d, %d)" % (istart, istop, width))
ValueError: empty range for randrange() (96,96, 0)
>>>
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