IndexError：使用元组时列表索引超出范围

Question

我很困惑。我在第 43 行收到一条错误消息，指出列表索引超出范围。任何帮助表示赞赏。

def tokenize(lines):
words = []
for line in lines:
    start = 0
    end = start + 1
    while start < len(line):
        character = line[start]
        if character.isspace():
            end += 1
        elif character.isalpha():
            end = start + 1
            while end < len(line) and line[end].isalpha():
                end += 1
            words.append(line[start:end].lower())
        elif character.isdigit():
            end = start + 1
            while end < len(line) and line[end].isdigit():
                end += 1
            words.append(line[start:end])
        else:
            end += 1
            words.append(line[start:end])
        start = end
return words


def countWords(words, stopWords):
    wordDict = {}
    for word in words:
        if word in stopWords:
            continue
        elif not word in wordDict:
            wordDict[word] = 1
        else:
            frequency = wordDict.get(word)
            wordDict[word] = frequency + 1
    return wordDict


def printTopMost(frequencies, n):
    listOfTuples = sorted(frequencies.items(), key=lambda x:x[1], reverse=True)
    for x in range(n):
        pair = listOfTuples[x]
        word = pair[0]
        frequency = str(pair[1])
        print(word.ljust(20), frequency.rjust(5))

pair = listOfTuples[x] 给我一个错误。请帮助我，为什么我必须添加这么多文字，它说的主要是代码。

这就是函数的调用方式：（test.py）还有我创建的其他函数的说明，比如 tokenize 和 countWords，但我得到的错误不是我的一部分，这就是我的原因我已经把它们排除在外了。

def printTopMost(freq,n):
    saved = sys.stdout
    sys.stdout = io.StringIO()
    wordfreq.printTopMost(freq,n)
    out = sys.stdout.getvalue()
    sys.stdout = saved
    return out


    test(printTopMost,({"horror": 5, "happiness": 15},0),"")
    test(printTopMost,({"C": 3, "python": 5, "haskell": 2, "java": 
    1},3),"python                  5\nC                       3\nhaskell                 
    2\n")

完整的错误信息

Traceback (most recent call last):
  File "C:/Users/Daniel/Documents/Scripts/Chalmers/lab1/test.py", line 81, in <module>
    run()
  File "C:/Users/Daniel/Documents/Scripts/Chalmers/lab1/test.py", line 70, in run
    test(printTopMost,({},10),"")
  File "C:/Users/Daniel/Documents/Scripts/Chalmers/lab1/test.py", line 8, in test
    z = fun(*x)
  File "C:/Users/Daniel/Documents/Scripts/Chalmers/lab1/test.py", line 41, in printTopMost
    wordfreq.printTopMost(freq,n)
  File "C:\Users\Daniel\Documents\Scripts\Chalmers\lab1\wordfreq.py", line 4, in printTopMost
    pair = listOfTuples[x]
IndexError: list index out of range

Condition failed:
   printTopMost({'horror': 5, 'happiness': 15}, 0) == ''
printTopMost returned/printed:
happiness               15
horror                   5

Condition failed:
   printTopMost({'C': 3, 'python': 5, 'haskell': 2, 'java': 1}, 3) == 'python                  5\nC                       3\nhaskell                 2\n'
printTopMost returned/printed:
python                   5
C                        3
haskell                  2
java                     1

https://i.imgur.com/9SciXtx.png

Answer 1

def printTopMost(frequencies, n):
    listOfTuples = sorted(frequencies.items(), key=lambda x:x[1], reverse=True)
    n=min(n,len(listOfTuples))
    for x in range(n):
        pair = listOfTuples[x]
        word = pair[0]
        frequency = str(pair[1])
        print(word.ljust(20), frequency.rjust(5))

简单的破解