Learn Python the hard way exercise 48__python

# Coding:utf-8 

Class Lexicon (object):

	def __init__ (self):
		# Dictionary to finds word on
		self.directions = [' South ', ' North ', ' East ', ' West ']
		self.verbs = [' Go ', ' kill ', ' eat ']
		self.stops = [', ', ', ' ', ']
		self. nouns = [' bear ', ' Princess ']
	
	def scan (self, sentence): Result
		
		= []
		
		words = Sentence.split ()
		
	# #  while (Len (words)!= 0):
		#	word = Words.pop (0) for
		word in words:
		# #	if (Self.direction.count ( Word = = 1):
			If Word in self.directions:
				result.append (' direction ', word)
			elif word in Self.verbs:
				result.append ((' verb ', word))
			elif Word in Self.stops:
				result.append ((' Stop ', word)
			elif Word In Self.nouns:
				result.append ((' noun ', word))
			else:
				try:
					word = int (word)
					result.append (' Number ', word ')
				except ValueError:
					result.append (' error ', word) ' return
		
results # test not instantiated Otherwise it will unbound
lexicon = Lexicon ()

Exercise 48 is the first time you write your own code, there are a lot of problems.

1.unboud: The test code for the exercise does not instantiate the lexicon and needs to be instantiated in the module.

2. about how to find the existence in the list:

Write It yourself:

if (self.direction.count (word) = = 1):

Later you see someone else's code:

If Word in self.directions:

It's OK,,,

3. Conditions of Circulation:

Also:

while (Len (words)!= 0):

	Word = words.pop (0)

This is OK (you don't have to define word:

For word in words:

But learned a lot of list method.

There are some questions:

The book is: from ex48 import Lexicon

And I: From Game.lexicon import Lexicon. Not adding ' lexicon ' will Importerror

Query import usage, point is subfolder