Learn Python The Hard Way ex41中的程序

最新推荐文章于 2023-02-21 20:20:16 发布

ch8936

最新推荐文章于 2023-02-21 20:20:16 发布

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这是一个能够从网上获取词汇并用于生成随机代码片段的Python程序。它使用这些词汇来为类名、变量名等命名，并解释生成代码的意义。

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
PHRASE_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)
		
		#fake other_names
		for word in other_names:
			result = result.replace("***", word, 1)
			
		#fake parameter lists
		for word in param_names:
			result = result.replace("@@@", word, 1)
			
		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"

这个程序的作用是在网一个网址获取一些单词，用这些单词命名程序的代码块和其中的元素。不管你在>后输入什么，程序都会将该代码块的含义及作用打印出来。

当你按Ctrl+Z的时候，程序退出并打印Bye

运行如下：