Question

尝试从＆＃34;以艰难的方式学习Python＆＃34;来运行脚本。并得到这个错误，尝试了几件事，但我有点卡住了。在运行脚本

时，使用argv并且参数不足的人看到了类似的错误

错误指向第70行：

question, answer = convert(snippet, phrase)

完整代码：

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, nd 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)

    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"

Answer 1

您正在尝试解包函数results返回的convert(*args)中的两个值。

但是，在您的函数convert中，您将返回一个列有result项的列表，该列表会附加到results。所以，你只有一个值而不是两个来解包

为了完整起见....

假设您的函数convert 在此列表中返回了两个以上的值，您尝试解压缩它们。你也会收到一个错误，但这次你有太多的值要解压缩。在这种情况下，您可以采取以下措施：

some_var, *other = convert(snippet, phrase)

Answer 2

以上注释对于您遇到的问题是正确的，但是发布的代码示例未显示正确的缩进。类中的for sentence in snippet, phrase循环不会追加额外的值，从而产生正确的question, answer = convert(snippet, phrase)。将代码更改为以下代码，它应运行正常（在此处测试）：

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)

    for word in param_names:
        result = result.replace("@@@", word, 1)

    results.append(result)
return results

Answer 3

<强>问题

在您的代码中，convert（）返回一个列表，该列表是一个对象或值。通过执行question, answer = convert(snippet, phrase)，您需要返回两个值，然后插入question和answer。

<强>解决方案

你应该改变

question, answer = convert(snippet, phrase)

到

results = convert(snippet, phrase)

然后，您可以通过

从结果中获得问题和答案（假设它们位于索引0和1）

question = results[0]
answer = results[1]

python＆＃34;需要超过1个值才能解压缩＆＃34;

3 个答案: