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POComparing objects with nose
 

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  1. POComparing objects with nose
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    <p>I'm working my way through Learn Python the Hard way Exercise 49 (<a href="http://learnpythonthehardway.org/book/ex49.html" rel="nofollow">http://learnpythonthehardway.org/book/ex49.html</a>) and I need to compare two different objects. This is the code I need to test:</p> <pre><code>class ParserError(Exception): pass class Sentence(object): def __init__(self, subject, verb, object): # remember we take ('noun','princess') tuples and convert them self.subject = subject[1] self.verb = verb[1] self.object = object[1] def peek(word_list): if word_list: word = word_list[0] return word[0] else: return None def match(word_list, expecting): if word_list: word = word_list.pop(0) #Here it's returning 'noun' from the noun/princess tuple if word[0] == expecting: #Here it's testing whether or not the new item in the 0 position ('noun' in this case) = expecting return word else: return None else: return None def skip(word_list, word_type): while peek(word_list) == word_type: match(word_list, word_type) def parse_verb(word_list): skip(word_list, 'stop') if peek(word_list) == 'verb': return match(word_list, 'verb') else: raise ParserError("Expected a verb next.") def parse_object(word_list): skip(word_list, 'stop') next = peek(word_list) if next == 'noun': return match(word_list, 'noun') if next == 'direction': return match(word_list, 'direction') else: raise ParserError("Expected a noun or direction next.") def parse_subject(word_list, subj): verb = parse_verb(word_list) obj = parse_object(word_list) return Sentence(subj, verb, obj) def parse_sentence(word_list): skip(word_list, 'stop') start = peek(word_list) if start == 'noun': subj = match(word_list, 'noun') return parse_subject(word_list, subj) elif start == 'verb': # assume the subject is the player then return parse_subject(word_list, ('noun', 'player')) else: raise ParserError("Must start with subject, object, or verb not: %s" % start) </code></pre> <p>My problem is with the function <code>parse_sentence</code> where I'm supposed to create a sentence object. So I need to create another sentence object in my test code and make sure it is identical:</p> <pre><code>def test_parse_subject(): word_list = [('verb', 'kill'), ('direction', 'north')] subj = ('noun', 'princess') verb = ('verb', 'kill') obj = ('direction', 'north') obj_sent = Sentence(subj, verb, obj) assert_equal(parser.parse_subject(word_list, subj), obj_sent) </code></pre> <p>But I keep receiving this traceback error:</p> <pre><code>Traceback (most recent call last): File "G:\Python27\lib\site-packages\nose\case.py", line 197, in runTest self.test(*self.arg) File "G:\Users\Charles\dropbox\programming\parsing_test\skeleton\tests\parser_tests.py", line 45, in test_parse_subjec t assert_equal(parser.parse_subject(word_list, subj), obj_sent) AssertionError: &lt;ex49.parser.Sentence object at 0x02651C50&gt; != &lt;ex49.parser.Sentence object at 0x02651C30&gt; </code></pre> <p>So it's not returning the objects as the same, but I'm pretty sure they are. I gave them the right arguments. If the objects are the same, how do I confirm this? Thanks in advance</p>
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    1. USCharles Smith
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