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I'm working on Python in a difficult way, exercise 48, using nosetests to test tuples I am determined that the following types are: 

  def test_directions (): assert_equal (lexicon.scan ("answer"), [('direction', 'answer']])   
 However, I get the following error every time:  
  ... line 5, test_directions assert_equal (lexicon.scan ("answer"), [ ('Direction', 'answer')] Type type: unbound method scan () first Should be called with a Lexicon example as a (got RR frequency instead)   
 If I present just above @staticmethod "def scan (self):" I would rather This error is found:  
  line 24, in the scan words = self.sentence.split () attribute error: 'str' is not an attribute of the object 'sentence'   
 and the code I am testing it is below. What am I missing?  
  class terminology T): def __init __ (self, sentences): self.sentence = sentences self.direction = "direction" self.verb = "verb" self. In the name of the self itself, "self.number =" number "self.number =" number "self.direction_words = ('north', 'south', 'east', 'west', 'up', 'down' ) Self.stop_words = ('the', '' ',' ',' self ',' a ',' ',' ',' ',' ',' '' A, 'A', 'A', 'A', 'A', 'It'). Self = 1 self-instructions = [] DRF scan (self): word = self-adjusting. Split () self.a = 0 While the self. A & lt; lan (words): results = words [self] A. If the result is in self: Directions_days: self.instructions.append (('direction', result)) elif Results themselves .verb_words: self.instructions.append (('verb', result)) elif results in itself. Noun_words: self.instructions.append (('noun,' result)) elif results in itself. Stop_words: self.instructions .append ('stop', results)) Self elif Test_num (results) == None: self.instructions.append (('number', 'error')) Other: self.instructions.append (('number' , Result)) self.a + = 1 return self.instructions def test_num (self, number): try: valueError: return (num) return    
 < Div class = "post-text" itemprop = "text"> 
 It looks like you're already with your string You need to paste the Lexicon object, then scan that object. In summary:  
  def test_directions (): assert_equal (lexicon ("answer"). Scan (), [('direction', 'answer']])   
 You can see this because the  __ init __  method takes  sentence  as a logic, while the  scan  method does not contain any real Logic is not (simply  self , which shows an example of an object). Due to the use of  @staticmethod , this sentence (in this case, "Answer") is caused by the treatment of the example as the  lexicon  class, which causes clear reasons Fails for

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