Python 无法通过艰苦的学习理解第41课
无法理解短语部分中的代码。这是通过艰苦的方式学习Python的代码。听了这段话我很迷茫。有人能解释一下吗 这本书对下面的代码没有任何解释Python 无法通过艰苦的学习理解第41课,python,Python,无法理解短语部分中的代码。这是通过艰苦的方式学习Python的代码。听了这段话我很迷茫。有人能解释一下吗 这本书对下面的代码没有任何解释 import random from urllib import urlopen import sys WORD_URL = "http://learncodethehardway.org/words.txt" WORDS = [] PHRASES = { "class %%%(%%%):": "Make a class named %
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"
短语是一个包含问题描述(如“创建一个名为X的类,该类是Y”)和解决方案(如“X(Y)”的类)的字典 代码从字典中随机选取一个问题/解决方案对,从
http://learncodethehardway.org/words.txt
并随机选择一些单词来填充占位符值,例如%%
和***
(因此每次的解决方案都不同),要求您键入解决方案,然后打印正确的解决方案