A Python 3 dice class in that rolls between 3 and the systems word size.

dice.py

'''
.. module:: dice
.. moduleauthor:: Jack Bartolone <jackbartolone@comcast.net>
'''

import random
import operator
import sys

class Dice(object):
    '''
    Python 3 dice used to roll a random an integer 
    between 3 to 2^63 -1 for 64-bit machines and 3 to 2^31-1 for 32-bit machines.
    '''
    #constants
    MINSIDES = 3 

    #constructors
    def __init__(self, sides):
        '''
        Intializes dice with :param sides
        
        :param sides: sides of the dice
        :raises: Exception for out of bounds and non-integer values
        '''
        self.sides = sides
     
    #range check
    sides = property(operator.attrgetter('_sides'))
    
    @sides.setter
    def sides(self, value):
        '''
        Throws exceptions for invalid input.
        
        :param value: setter value
        '''
        if (value <= self.MINSIDES): 
            raise Exception('Dice can must have at least three sides')
        elif (value > sys.maxsize): 
            raise Exception('Dice value exceeds max int size')
        elif (isinstance(value, int)):
            raise Exception('Dice value is not an integer')
        else:
            self._sides = value
        
    #methods
    def roll(self):
        '''
        Rolls dice. 
        
        :returns: pseudorandom integer between 1 and its sides 
        '''
        result = random.randint(1, self.sides)
        return result

dicetest.py

'''
.. module:: dice
.. moduleauthor:: Jack Bartolone <jackbartolone@comcast.net>
'''

import pytest
import dice
import sys

def testlowerbounds():
    '''Test if numbers < 3 throw exception'''
    with pytest.raises(Exception):
        dice(1)
        
def testinbounds():
    '''Test if sys.maxsize + 1> numbers >= 3 not throw exception'''
    with pytest.raises(Exception):
        dice(3)
        
def testupperbounds():
    '''Test if sys.maxsize + 1 > numbers throw exception'''
    with pytest.raises(Exception):
        dice(sys.maxsize + 1)
            
def testisaninteger():
    '''Test if throwing exception for non-integer value'''
    with pytest.raises(Exception):
        dice('word')
    
testlowerbounds()
testinbounds()
testupperbounds()
testisaninteger()
#print docs
help(Dice)