目標：利用測試程序來寫函數。
體會：一步一步來，完成后開森~

# -*-coding:utf-8 -*-## 預定義詞匯表 verbs = ('go', 'stop', 'kill', 'eat') directions = ('north', 'south', 'east', 'west', 'down', 'up', 'left', 'right', 'back') stops = ('the', 'in', 'of', 'from', 'at', 'it') nouns = ('door', 'bear', 'princess', 'cabinet')def scan(stuff):## 結果存儲L = []words = stuff.split()for word in words:if word in verbs:L.append(('verb', word))elif word in stops:L.append(('stop', word))elif word in nouns:L.append(('noun', word))## 判斷是否全是數字elif word.isdigit():L.append(('number', int(word)))elif word in directions:L.append(('direction', word))else:L.append(('error', word))return L

測試用例的代碼如下（原書提供）：

from nose.tools import * from ex48 import lexicondef test_directions():assert_equal(lexicon.scan("north"), [('direction', 'north')])result = lexicon.scan("north south east")assert_equal(result, [('direction', 'north'),('direction', 'south'),('direction', 'east')])def test_verbs():assert_equal(lexicon.scan("go"), [('verb', 'go')])result = lexicon.scan("go kill eat")assert_equal(result, [('verb', 'go'),('verb', 'kill'),('verb', 'eat')])def test_stops():assert_equal(lexicon.scan("the"), [('stop', 'the')])result = lexicon.scan("the in of")assert_equal(result, [('stop', 'the'),('stop', 'in'),('stop', 'of')])def test_nouns():assert_equal(lexicon.scan("bear"), [('noun', 'bear')])result = lexicon.scan("bear princess")assert_equal(result, [('noun', 'bear'),('noun', 'princess')]) def test_numbers():assert_equal(lexicon.scan("1234"), [('number', 1234)])result = lexicon.scan("3 91234")assert_equal(result, [('number', 3),('number', 91234)]) def test_errors():assert_equal(lexicon.scan("ASDFASDFASDF"), [('error', 'ASDFASDFASDF')])result = lexicon.scan("bear IAS princess")assert_equal(result, [('noun', 'bear'),('error', 'IAS'),('noun', 'princess')])

總結

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