import random
from urllib import urlopen
import sys
WORD_URL = "http://learncodethehardway.org/words.txt"
WORDS = []
PHRASES = {
"class %%%(%%%):":
"Make a class named %%% that is-a %%%.",
"class %%%(object):\n\tdef __init__(self, ***)":
"class %%% has-a __init__ that takes self and *** parameters.",
"class %%%(object):\n\tdef ***(self, @@@)":
"class %%% has-a function named *** that takes self and @@@ parameters.",
"*** = %%%()":
"Set *** to an instance of class %%%.",
"***.***(@@@)":
"From *** get the *** function, and call it with parameters self, @@@.",
"***.*** = '***'":
"From *** get the *** attribute and set it to '***'."
}
# do they want to drill phrases first
PHRASES_FIRST = False
if len(sys.argv) == 2 and sys.argv[1] == "english":
PHRASE_FIRST = True
# load up the words from the website
for word in urlopen(WORD_URL).readlines():
WORDS.append(word.strip())
def convert(snippet, phrase):
class_names = [w.capitalize() for w in random.sample(WORDS, snippet.count("%%%"))]
other_names = random.sample(WORDS, snippet.count("***"))
results = []
param_names = []
for i in range(0, snippet.count("@@@")):
param_count = random.randint(1, 3)
param_names.append(', '.join(random.sample(WORDS, param_count)))
for sentence in snippet, phrase:
result = sentence[:]
# fake class names
for word in class_names:
result = result.replace("%%%", word, 1)
snippet = snippet.replace("%%%", word, 1)
# fake other names
for word in other_names:
result = result.replace("***", word, 1)
snippet = snippet.replace("***", word, 1)
# fake parameter lists
for word in param_names:
result = result.replace("@@@", word, 1)
snippet = snippet.replace("@@@", word, 1)results.append(snippet)
results.append(result)
return results
# keep going until they hit CTRL-D
try:
while True:
snippets = PHRASES.keys()
random.shuffle(snippets)
for 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"
# 在命令列裡邊執行
(ex41.py所在的目錄）> python ex41.py
class Cellar(object):
def corn(self, control, distance)
(程式碼裡raw_input的提示符，需要使用者輸入）>class Cellar has-a function...
ANSWER: class Cellar has-a function named corn that takes self and control, distance parameters.
beetle.crate = 'cow'
>(不想練習了，就Ctrl + c 結束）
練習從語言到程式碼
#反過來練習，加上english引數執行指令碼
> python ex41.py english
From committee get the carriage function, and call it with parameters self, bottle.
> committee.carriage(self, bottle)
ANSWER: committee.carriage(bottle)
From dirt get the cry attribute and set it to 'ant'.
>
