Python Help - Learn Python The Hard Way exercise 41 "phrase = PHRASES[snippet]" -

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i learning python - first programming language learning. little confused 1 line of code. full code can found @ http://learnpythonthehardway.org/book/ex41.html

import random urllib import urlopen import sys  word_url = "http://learncodethehardway.org/words.txt" words = []  phrases = { "class %%%(%%%):":     "make class named %%% is-a %%%.", "class %%%(object):\n\tdef __init__(self, ***)" :     "class %%% has-a __init__ takes self , *** parameters.", "class %%%(object):\n\tdef ***(self, @@@)":     "class %%% has-a function named *** takes self , @@@ parameters.", "*** = %%%()":     "set *** instance of class %%%.", "***.***(@@@)":     "from *** *** function, , call parameters self, @@@.", "***.*** = '***'":     "from *** *** attribute , set '***'." }  # want drill phrases first phrase_first = false if len(sys.argv) == 2 , sys.argv[1] == "english": phrase_first = true  # load words website word in urlopen(word_url).readlines(): words.append(word.strip())  def convert(snippet, phrase): class_names = [w.capitalize() w in                 random.sample(words, snippet.count("%%%"))] other_names = random.sample(words, snippet.count("***")) results = [] param_names = []  in range (0, snippet.count("@@@")):     param_count = random.randint(1,3)     param_names.append(', '.join(random.sample(words, param_count)))  sentence in snippet, phrase:     result = sentence[:]      # fake class name     word in class_names:         result = result.replace("***", word, 1)      # fake other names     word in other_names:         result = result.replace("***", word, 1)      # fake parameter lists     word in param_names:         result = result.replace("@@@", word, 1)       results.append(result)  return results   # keep going until hit ctrl-d try: while true:     snippets = phrases.keys()     # returns randomly shuffled dictionary keys list     random.shuffle(snippets)      snippet in snippets:         phrase = phrases[snippet]         question, answer = convert(snippet, phrase)         if phrase_first:             question, answer = answer, question          print question          raw_input("> ")         print "answer:  %s\n\n" % answer except eoferror: print "\nbye"

it 11th line of code bottom don't quite understand: phrase = phrases[snippet]. since snippet in for snippet in snippets: looping through keys of randomized-shuffled phrases list, why can't code phrase = snippet. in advance help. cheers - darren


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