Python 代码，从书本和网站上复制但仍然无法运行 3.4

Question

首先，我是 Python 的新手，如果这个问题很明显，我很抱歉。检测英语模块似乎是错误的，但在调用它并运行单独调用它时它运行良好，单独运行调用它时没有错误，我已经重写了几次三重检查它。

Traceback (most recent call last):
  File "H:\Python\Python Cipher Program\transposition hacker.py", line 49, in <module>
    main()
 File "H:\Python\Python Cipher Program\transposition hacker.py", line 11, in   main
 hackedMessage = hackTransposition(myMessage)
 File "H:\Python\Python Cipher Program\transposition hacker.py", line 34, in hackTransposition
  if detectEnglish.isEnglish(decryptedText):
File "H:\Python\Python Cipher Program\detectEnglish.py", line 48, in isEnglish
 wordsMatch = getEnglishCount(message) * 100 >= wordPercentage
 TypeError: unsupported operand type(s) for *: 'NoneType' and 'int'

这是我在尝试运行 Transposition Hacker 时遇到的错误（直接从 here

复制

这是检测英语模块的代码 # 检测英文模块

# to use this code
# import detectEnglish
# detectEnglish.isEnglish(somestring)
# returns true of false
# there must be a dictionary.txt file in the same directory
# all english words
# one per line

UPPERLETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
LETTERS_AND_SPACE = UPPERLETTERS + UPPERLETTERS.lower() + ' \t\n'


def loadDictionary()
 dictionaryFile = open('Dictionary.txt')
englishWords = {}
for word in dictionaryFile.read().split('\n'):
    englishWords[word] = None
dictionaryFile.close()
return englishWords

 ENGLISH_WORDS = loadDictionary()

def getEnglishCount(message):
message = message.upper()
message = removeNonLetters(message)
possibleWords = message.split()
if possibleWords == []:
    return 0.0

matches = 0
for word in possibleWords:
    if word in ENGLISH_WORDS:
        matches += 1
        return float(matches) / len(possibleWords)

def removeNonLetters(message):
lettersOnly = []
for symbol in message:
    if symbol in LETTERS_AND_SPACE:
        lettersOnly.append(symbol)
return ''.join(lettersOnly)

def isEnglish(message, wordPercentage=20, letterPercentage=85):
# by default 20% of the words mustr exist in dictionary file
# 85% of charecters in messafe must be spaces or letters
wordsMatch = getEnglishCount(message) * 100 >= wordPercentage
numLetters = len(removeNonLetters(message))
messageLettersPercentage = float(numLetters) / len(message) * 100
lettersMatch = messageLettersPercentage >= letterPercentage
return wordsMatch and lettersMatcht

Answer 1

getEnglishCount 看起来好像缺少 return 语句。如果 python 到达函数的末尾而没有遇到 return 语句，它将 return None 如您所见。

试试这个：

def getEnglishCount(message):
    message = message.upper()
    message = removeNonLetters(message)
    possibleWords = message.split()
    # if possibleWords == []:  # redundant
    #     return 0.0
    return len(possibleWords)

编辑： @Kevin 是的，我认为你是对的 - 该功能还有更多内容。也许试试这个：

def getEnglishCount(message):
    message = message.upper()
    message = removeNonLetters(message)
    possibleWords = message.split()
    if possibleWords == []:
        return 0.0

    matches = 0.
    for word in possibleWords:
        if word in ENGLISH_WORDS:
            matches += 1
    return matches / len(possibleWords)

我猜当您复制并粘贴代码时缩进不知何故发生了变化，return 语句嵌套在 if.

下

Answer 2

正如其他张贴者所说，您缺少 getEnglishCount 方法的 return，因此它是 returning NoneType，这意味着没有价值 return编辑

您不能对 NoneTypes 进行数学运算，因此 NoneType*100 失败，这就是错误回溯底部所说的内容。

Python 代码，从书本和网站上复制但仍然无法运行 3.4

Python code, copied from book & website but still not working 3.4

python

encryption