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python - 无法理解《Learn Python the Hard way》中的第 41 讲

转载 作者:太空宇宙 更新时间:2023-11-03 16:24:49 27 4
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无法理解 PHRASES 部分的代码。这是《Python 艰难之路》中的代码。那部分之后我很失落。有人可以解释一下吗?

书中没有对下面的代码进行任何解释。

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
if len(sys.argv) == 2 and sys.argv[1] == "english":
PHRASE_FIRST = True
else:
PHRASE_FIRST = False

# 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"

最佳答案

PHRASES 是一个字典,包含问题描述(例如“创建一个名为 X 的类,它是 Y”)和解决方案(例如“类 X(Y)”)。

代码从字典中随机选择一个问题/解决方案对,从http://learncodethehardway.org/words.txt获取单词列表,并随机选择一些单词进行填充对于诸如 %%%*** 之类的占位符值(以便解决方案每次都不同),要求您输入解决方案,然后打印正确的解决方案。

关于python - 无法理解《Learn Python the Hard way》中的第 41 讲,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38089534/

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