[Tutor] Beginner - Clarifying 'understanding randint arguments'

[Marc Eymard]

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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From: marc_eymard at hotmail.com
To: tutor at 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
 		 	   		  
 		 	   		  
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