import sys
lijst_salades = {'Eiersalade' : 5.99,
'Paprikasalade' : 6.05,
'truffelsalade': 3.99
}
input = (sys.stdin.readline())
print(lijst_salades[input])
它给我一个错误
追溯（最近一次通话）：文件 “ C：/some/random/dir/right/here/progr.py”，第9行，在 print（lijst_salades [input]）KeyError：'truffelsalade \ n'
Can someone explain what is did wrong?
If I use print(lijst_salades['Eiersalade'] it works fine.
The problem is that you read the \n char with the input passed, as the error state:
KeyError：“ truffelsalade \ n”
您应该将代码修复为：
import sys
lijst_salades = {'Eiersalade' : 5.99,
'Paprikasalade' : 6.05,
'truffelsalade': 3.99
}
input = (sys.stdin.readline()).rstrip()
print(lijst_salades[input])
Also, it is advised to add a testing to the input, because if the key doesn't exist it will also raise an error of type KeyError.
编辑
您可以在以下链接中了解转义字符：
https://linuxconfig.org/list-of-python-escape-sequence-characters-with-examples