如何将用户输入转换为等效的变量？

Question

我正在制作一个编码和解码程序，现在我正在制作解码程序。我已经取代不同的字母在整个英文字母（例如A = E，B = F，C =克）和我写，对于用户要求输入使用加密的消息的代码：

encrypted_message = input("Insert the encrypted message") 

我想这样做，用户可以输入​​，python会将​​翻译成"efg"然后输入回来。

Answer 1

使用字典和然后映射用户的输入到字典的get方法来检索每个值：

>>> d = {'a':'e', 'b':'f', 'c':'g'} 
>>> print(*map(d.get, 'cab'), sep='') 
gef 

Answer 2

使用translate()方法：

对于Python 2.x的：

from string import maketrans 

encrypted = "abc"         # chars to be translated 
decrypted = "efg"         # their replacements 

trantab = maketrans(originals, encrypted)  # make translation table from them 

print encrypted_message.translate(trantab)  # Apply method translate() to user input 

对于Python 3.x：

encrypted = "abc"         # chars to be translated 
decrypted = "efg"         # their replacements 

trantab = str.maketrans(encrypted, decrypted) # make translation table from them 

print(encrypted_message.translate(trantab)) # Apply method translate() to user input