Python中的KeyError莫尔斯电码翻译器

Question

我正在写一个莫尔斯电码到Python 3中的莫尔斯电码程序，它似乎工作正常，直到我给它一个字母然后我得到以下错误：

Traceback (most recent call last): 
    File "X:\GCU\CST-110\Week 5 Projects\Python Projects\Chapter 9 Exercise 21.py", line 79, in <module> 
    print(words_to_morse(morse_dict)) 
    File "X:\GCU\CST-110\Week 5 Projects\Python Projects\Chapter 9 Exercise 21.py", line 45, in words_to_morse 
    print(morse_dict[ch],end="") 
KeyError: 'J' 

我在哪里错过了问题？代码如下。感谢您的帮助。

import string 
def process_line(fileObj): 
    morse_dict={} 
    reverse_morse_dict={} 
    for line in fileObj: 
     line.strip() 
     line=line.split() 
     morse_dict[line[0]]=line[1] 
     for key,value in list(morse_dict.items()): 
      reverse_morse_dict[value]=key 
      return morse_dict,reverse_morse_dict 
def words_to_morse(morse_dict): 
    words_str=input("\nEnter text to translate: ") 
    words_str.strip() 
    words_list=words_str.split() 
    for word in words_list: 
     for ch in word: 
      if ch in string.ascii_letters: 
       ch=ch.upper() 
       print(morse_dict[ch],end="") 
       if word!=words_list[-1]: 
        print("/",end="\n") 
def morse_to_words(reverse_morse_dict): 
    morse_str=input("\nEnter morse code to translate: ") 
    print("") 
    morse_str.strip() 
    morse_str=morse_str.replace("/",".-.-..-.-.") 
    morse_list=morse_str.split() 
    words_list=[] 
    for code in morse_list: 
     words_list.append(reverse_morse_dict[code]) 
     lower_words_list=[] 
     for ch in words_list: 
      if ch in string.ascii_letters: 
       ch=ch.lower() 
       lower_words_list.append(ch) 
      else: 
       lower_words_list.append(ch) 
       lower_words_str="".join(lower_words_list) 
       lower_words_str=lower_words_str.replace("++","") 
       print(lower_words_str) 
fileObj=open("morse.txt","r") 
morse_dict,reverse_morse_dict=process_line(fileObj) 
print("\nHi, this program is used to translate text into morse code or translate morse code to text") 
choice_str=input("\nEnter input translate code - 't' for text to morse code or 'm' for morse code to text: ") 
choice_list=choice_str.split() 
while True: 
    if choice_list[0]=="t": 
     print(words_to_morse(morse_dict)) 
     break 
    if choice_list[0]=="m": 
     print() 
     print(morse_to_words(reverse_morse_dict)) 
     break 
    else: 
     print("\nThat is an invalid input command") 
     choice_str=input("\nEnter input code again, 't' for text or 'm' for morse code: ") 
     choice_list=choice_str.split() 
     continue 
print() 
print("\nThanks for using Morse-text converter") 

Answer 1

1）process_line()没有返回正确morse_dict，它是一个局部变量，外部返回它的for循环，并且还

2）下面片没有存储字符作为密钥，将其存储字作为键

for line in fileObj: 
    line.strip() 
    line=line.split()