当使用元组作为字典键时，Python3会给我KeyError
当使用元组作为字典键时，Python3会给我KeyError
提问于 2018-06-22 06:59:41
问题是在for循环中很难将输入用作字典的键，我尝试使用元组和列表，但结果相同
代码如下：
import re
morse = {
"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" : "--..",
"0" : "-----",
"1" : ".----",
"2" : "..---",
"3" : "...--",
"4" : "....-",
"5" : ".....",
"6" : "-....",
"7" : "--...",
"8" : "---..",
"9" : "----.",
"." : ".-.-.-",
"," : "--..--",
" " : " "
}
print("""
MORSECODE ENCYPTER """)
print("Enter the text to convert(keep in mind that upper case character, numbers , (.) and (,) are only allowed) :",end = '')
to_encrypt = input()
tuple1 = tuple( re.findall("." , to_encrypt) )
print (tuple1)
for i in tuple1 :
print(morse[tuple1]) 当我输入to_encrypt输入(例如H)时，它会给我：
Traceback (most recent call last):
File "x.py", line 50, in <module>
print(morse[tuple1])
KeyError: ('H',)回答 1
Stack Overflow用户
回答已采纳
发布于 2018-06-22 07:42:51
首先，你的for循环似乎是不正确的，你可以试试这个：
to_encrypt = list(str(input()))
for ch in to_encrypt:
morse_val = morse.get(ch, None)
if not morse_val:
print('could not encode ', ch)
else:
print(morse_val)如果你需要更好的澄清，请告诉我。P.S -上面的代码假设你已经定义了morse字典。此外，我没有看到在这里使用正则表达式的目的。
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原文链接：
https://stackoverflow.com/questions/50978521
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