Question

我一直在尝试制作一个python morse代码转换器并且使它复杂化，我想继续我正在进行摩尔斯电码转换器的路径，但我遇到了一个问题。

Traceback (most recent call last):
  File "python", line 114, in <module>
NameError: name 'firstletter' is not defined

我无法弄清楚为什么没有定义这个变量。这是代码

wordinput = input("What do you want to convert")
word = str(wordinput.upper)

if word[0] == 'A':
    firstletter = ".-"
elif word[0] == "B":
    firstletter = "-..."
elif word[0] == 'C':
    firstletter = '-.-.'
elif word[0] == 'D':
    firstletter = '-..'
elif word[0] == 'E':
    firstletter = '.'
elif word[0] == 'F':
    firstletter = '..-.'
elif word[0] == 'G':
    firstletter = '--.'
elif word[0] == "H":
    firstletter = '....'
elif word[0] == "I":
    firstletter = '..'
elif word[0] == 'J':
    firstletter = ".."
elif word[0] == 'K':
    firstletter = '-.-'
elif word[0] == 'L':
    firstletter = '.-..'
elif word[0] == 'M':
    firstletter = '--'
elif word[0] == 'N':
    firstletter = '-.'
elif word[0] == 'O':
    firstletter = '---'
elif word[0] == 'P':
    firstletter = '.--.'
elif word[0] == 'Q':
    firstletter = '--.-'
elif word[0] == 'R':
    firstletter = '.-.'
elif word[0] == 'S':
    firstletter = '...'
elif word[0] == 'T':
    firstletter = '-'
elif word[0] == 'U':
    firstletter = '..-'
elif word[0] == 'V':
    firstletter = '...-'
elif word[0] == 'W':
    firstletter = '.--'
elif word[0] == 'X':
    firstletter = '-..-'
elif word[0] == 'Y':
    firstletter = '-.--'
elif word[0] == 'Z':
    firstletter = '--..'

if word[1] == 'A':
    secondletter = ".-"
elif word[1] == "B":
    secondletter = "-..."
elif word[1] == 'C':
    secondletter = '-.-.'
elif word[1] == 'D':
    secondletter = '-..'
elif word[1] == 'E':
    secondletter = '.'
elif word[1] == 'F':
    secondletter = '..-.'
elif word[1] == 'G':
    secondletter = '--.'
elif word[1] == "H":
    secondletter = '....'
elif word[1] == "I":
    secondletter = '..'
elif word[1] == 'J':
    secondletter = ".."
elif word[1] == 'K':
    secondletter = '-.-'
elif word[1] == 'L':
    secondletter = '.-..'
elif word[1] == 'M':
    secondletter = '--'
elif word[1] == 'N':
    secondletter = '-.'
elif word[1] == 'O':
    secondletter = '---'
elif word[1] == 'P':
    secondletter = '.--.'
elif word[1] == 'Q':
    secondletter = '--.-'
elif word[1] == 'R':
    secondletter = '.-.'
elif word[1] == 'S':
    secondletter = '...'
elif word[1] == 'T':
    secondletter = '-'
elif word[1] == 'U':
    secondletter = '..-'
elif word[1] == 'V':
    secondletter = '...-'
elif word[1] == 'W':
    secondletter = '.--'
elif word[1] == 'X':
    secondletter = '-..-'
elif word[1] == 'Y':
    secondletter = '-.--'
elif word[1] == 'Z':
    secondletter = '--..'





print(firstletter + secondletter)
import os
os.system("pause")

Answer 1

你的问题在于作业：

word = str(wordinput.upper)

你未能调用函数 upper ;相反，您将函数描述符分配给 word 。将该描述符转换为字符串时，word的值为

"<built-in method upper of str object at 0x7f377ea143e8>"

因此，无论输入如何，您都试图转换'＆lt;'和'b';第一个没有覆盖你的列表，所以你的程序崩溃了。

更改线路以调用例程：

word = str(wordinput.upper() )

进一步的工作

The problem will still occur if the user enters any input other than pure letters.  Add a line before your long **if** to give a default value, whatever you'd like to see printed if the input isn't a letter.  I use a space here:

firstletter = ' '

<强> IMPROVEMENTS

使用参考字典：

code = { 'A': ".-", 'B': "-...", etc.
       }

添加一个循环来遍历字符串并转换单个字母：

for c in word:
    if c in code:
        morse_char = code[c]
    else:
        morse_char = ' '
    print(morse_char)

这会挽救你的手指肌肉吗？

Answer 2

我同意，我有两个提示给你第一：定义if语句上方的第一个字母和第二个字母要么第二

使用for循环转换如下

wordinput = input("")
word = str(wordinput.upper)

for letter in range(0,len(word)+1):
    if word[letter] == A:
        convertedword.append(.-)
...
...
...

为什么这个变量没有在Python中定义？

2 个答案: