Question

在这里做一个摩尔斯电码的项目，需要一些帮助。

它是如何工作的？

输入消息：PUEL
摩尔斯电码：。 - ... - ..- .. 4314（数字是指基于输入消息中每个字母的点和短划线数量的代码长度（由＆＃34分隔; ＆＃34）
反向访问莫尔斯电码字符串进行编码。（4314＆lt; - 在这里访问字符串）
使用反向数字串将点和短划线转换回文本（参见3）
结果：PERL

我制作的主要代码（重要代码）：

## this is my morseDictionary 
# convert from text to morsecode.
morseDictionary = {
    "A" : ".-",
    "B" : "-...",
    "C" : "-.-.",
    "D" : "-..",
    "E" : ".",
    "F" : "..-.",
    "G" : "--.",
    "H" : "....",
    "I" : "..",
    "J" : ".---",
    "K" : "-.-",
    "L" : ".-..",
    "M" : "--",
    "N" : "-.",
    "O" : "---",
    "P" : ".--.",
    "Q" : "--.-",
    "R" : ".-.",
    "S" : "...",
    "T" : "-",
    "U" : "..-",
    "V" : "...-",
    "W" : ".--",
    "X" : "-..-",
    "Y" : "-.--",
    "Z" : "--..",
    "_" : "..--",
    "," : ".-.-",
    "." : "---.",
    "?" : "----"

}

 # reverse dictionary of morseDictionary
 # convert from morse to text.
 morseReverse = dict((value,key) for (key,value) in morseDictionary.items())


# convert the message from string to morse code. Ex : .--...--- 2322
def convertMorseM(string):
  string1 = ""
  string2 = ""
  codecombine = ""
  code_length = ""
  final_string = ""
  for letter in string:
      string1 = morseDictionary[letter]
      string2 = str(len(morseDictionary[letter]))
      code_length = code_length + string2
      codecombine = codecombine + string1
      final_string = codecombine + " " + code_length
  return final_string

# where the encoding of morse applies (problem)
def encodeMessage(message):
  final_string = " "
  index = 0
  string = " "

  for items in message[::-1]:
      if items.isspace():
          return final_string
      string = morseReverse[(message[:index + int(items)])]
      final_string = final_string + string
      index = index + int(items)

  # main function
  def main():
    print("Welcome to morse code converter !")
    print("Enter your message to see your awesome message translated to a morse code !")
    message = input("Enter a message : ")
    message = message.upper()

    # function calling for all necessary items
    # numbers of characters in the message.
    codenum = str(len(message))

    # converts into morse code with code length etc : .--...--- 2322
    convMessage = convertMorseM(message)

    ## gets the code length of the string
    codLength = codeLength(message)

    ## encodeds the convMessage starting from behind <--
    encodeM = encodeMessage(convMessage)


    ## display all data here
    print("Your message : " + message)
    print("Morse code convert : " + convMessage)
    print("Word length : " + codenum)
    print("Code Length for each letter : " + codLength)
    print(" ")
    print("Encoded Message : " + encodeMessage)

    print(" ")

尝试此代码并发生错误：

   File "MorseCode.py", line 41, in encodeMessage
   string = morseRev[message[:index + int(items)]]
   KeyError : '.--...-'

我需要有关此问题的帮助。谢谢

Answer 1

您编写的程序过于复杂，因此我很难为您调试它。我更容易重写它，这样你就可以看到如何以更简单的方式做你想做的事情。从输入开始，我认为你真的只需要三件事：

作为一系列dits和dahs的输入（你不需要这里的空格）
反转长度
倒莫尔斯字典（从dit-dahs到字符）

得到（1）：

input = 'PUEL'
input_morse_str = ''.join([morse_dictionary[c] for c in input])

得到（2）：

此处不需要字符串（您在示例程序中执行str然后int，您也可以将它们保留为整数）：

reversed_lengths = list(reversed([len(morse_dictionary[c]) for c in input]))

最后，您还需要用于摩尔斯电码的倒置字典（3）：

inverse_dictionary = {value: key for (key, value) in morse_dictionary.items()}

使用这三种数据结构，您可以继续解码：

output = ''; i = 0
for l in reversed_lengths:
    output += inverse_dictionary[input_morse_str[i:i+l]]
    i += l
print output

这里的所有内容放在一个工作脚本中（输入硬编码）：

$ cat morse_reverse.py 
#!/usr/bin/env python

morse_dictionary = {
    "A" : ".-",   "B" : "-...", "C" : "-.-.", "D" : "-..",  "E" : ".",
    "F" : "..-.", "G" : "--.",  "H" : "....", "I" : "..",   "J" : ".---",
    "K" : "-.-",  "L" : ".-..", "M" : "--",   "N" : "-.",   "O" : "---", 
    "P" : ".--.", "Q" : "--.-", "R" : ".-.",  "S" : "...",  "T" : "-",
    "U" : "..-",  "V" : "...-", "W" : ".--",  "X" : "-..-", "Y" : "-.--",
    "Z" : "--..", "_" : "..--", "," : ".-.-", "." : "---.", "?" : "----"
}

inverse_dictionary = {value: key for (key, value) in morse_dictionary.items()}


input = 'PUEL'
input_morse = [morse_dictionary[c] for c in input]
input_morse_str = ''.join(input_morse)
reversed_lengths = list(reversed([len(c) for c in input_morse]))

output = ''
i = 0
for l in reversed_lengths:
    output += inverse_dictionary[input_morse_str[i:i+l]]
    i += l
print output
$ python morse_reverse.py
PERL

摩尔斯电码（Ohaver Scheme）Python

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