python,python-2.7 , How to check for multiple attributes in a list


How to check for multiple attributes in a list

Question:

Tag: python,python-2.7

I am making a TBRPG game using Python 2.7, and i'm currently making a quest system. I wanted to make a function that checks all of the quests in a list, in this case (quests), and tells you if any of of the quests in the list have the same ID or name, and if they do multiple_id and multiple_names will go up by 1.

class Quest:
    def __init__(self, target, name, ID, required_level, objective_requirements, reward_gold, reward_exp, reward_item):
        self.target = target
        self.name = name
        self.ID = ID
        self.req_level = required_level
        self.objective_default = 0
        self.objective_req = objective_requirement
        self.reward_gold = reward_gold
        self.reward_exp = reward_exp
        self.reward_item = reward_item

    def accept(self):
        if self.target.level >= self.req_level:
            self.target.quest.append(self.ID)
        else:
            pass

    def turn_in(self):
        if self.reward_exp >= 0:
            self.target.exp += self.reward_exp
            print '...'
        if self.reward_gold >= 0:
            self.target.gold += self.reward_gold
            print '...'
        if self.reward_item == None:
            pass
        else:
            self.target.inventory.append(self.reward)
            print '...'

def test_quests(list):
    multiple_id = 0
    multiple_names = 0
    for x in list[:]:
        print 'ID ' + str(x.ID)
        print 'Name ' + x.name
        print 'Target ' + str(x.target)
        print 'Required Level ' + str(x.req_level)
        print 'Objective Default ' + str(x.objective_default)
        print 'Objective Requirement ' + str(x.objevtive_req)
        print 'Reward Gold ' + str(x.reward_gold)
        print 'Reward Exp ' + str(x.reward_exp)
        print 'Reward Item' + str(x.reward_item)

    print "Multiple ID's found = %d" % multiple_id
    print "Multiple Name's found = %d" % multiple_names

me = 'Just a filler ATM...'
Quest1 = Quest(me, 'A Simple Task', 001, 0, 1, 100, 20, None)
Quest2 = Quest(me, 'A Difficult Task', 702, 0 , 1, 0 ,0, None)

quests = [Quest1, Quest2]
test_quests(quests)

I have no clue how to do this.


Answer:

You can create a set holding the different IDs and then compare the size of that set to the total number of quests. The difference tells you how many IDs are duplicated. Same for names.

Something like this (untested):

def test_quests(quests):
    num_total = len(quests)
    different_ids = len(set((q.ID for q in quests)))
    different_names = len(set((q.name for q in quests)))
    print "Multiple ID's found = %d" % (num_total - different_ids)
    print "Multiple Name's found = %d" % (num_total - different_names)

Also, it might be a good idea to implement Quest.__repr__ and/or Quest.__str__, so you just have to do print some_quest to print all the details of that quest.


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