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#! /usr/bin/env python
"""
Creates random questions for PacMath
@license: U{http://creativecommons.org/licenses/by-sa/3.0/us/}
"""
from random import randint
import pygame
class questionGenerator:
"""
A reusable object which is used to generate questions
"""
def __init__(self, operation, minOp, maxOp):
"""
Constructor
@param operation: The operation that the math questions will incorporate
@param minOp: The minimum allowable value for an operand
@param maxOp: The maximum allowable value for an operand
"""
self.minOp = minOp
self.maxOp = maxOp
self.operation = operation
def getQuestion(self):
"""
Returns a single question based on the constraints the generator
was created with
@rtype: ("q", "a")
@return: A single question answer tuple
"""
op1 = randint(self.minOp, self.maxOp)
op2 = randint(self.minOp, self.maxOp)
if( self.operation == ['x'] ):
answer = op1*op2
return (str(op1)+" x " + str(op2) + " = ?", str(answer))
if( self.operation == ['+'] ):
answer = op1+op2
return (str(op1)+" + "+ str(op2) + " = ?", str(answer))
elif( self.operation == ['-'] ):
answer = op1-op2
return (str(op1)+" - "+ str(op2) + " = ?", str(answer))
elif( self.operation == ['/'] ):
answer = op1*op2
return (str(answer)+" / "+ str(op1) + " = ?", str(op2))
else:
return null
def getQuestionSet(self):
"""
Returns a set of four questions for use in a round of pacmath,
ensures that no questions have duplicate answers.
Fails and exits if four questions with distinct answers cannot
be generated from this constraint set (eg minOp = 2, maxOp = 3:
only 2 * 2, 2 * 3, 3 * 3)
@rtype: [("q", "a"), ("q", "a"), ("q", "a"), ("q", "a")]
@return: A list of four questions with no repeat answers
"""
questions = []
attempts = 0
while len(questions) < 4 and attempts < 100:
toAdd = self.getQuestion()
notDuplicate = True
for i in questions:
if toAdd[1] == i[1]:
notDuplicate = False
attempts += 1
if notDuplicate:
questions.append( toAdd )
if attempts >= 100:
print "Bad question set, not enough questions could be generated"
print "Minimum Operand: " + str(self.maxOp)
print "Maximum Operand: " + str(self.minOp)
print "Operation: " + str(self.operation)
raise SystemExit
return questions
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