如何在python 3.2上格式化输入

Question

while True: 

    letter,Text,numRails= input("").split('\"')
    if numRails ==(""):
        numRails=(2)
        plainText= Text.strip()
    numRails=int(numRails)


    if letter.strip() == "E" or "e":
        x =Encrypt(numRails,Text)

    elif letter.strip()=="D" or "d":
        x =scramble2Decrypt(numRails,Text)

    else: print("invalid encryption command")

E "WEAREDISCOVEREDGO" 2 I need to be able to input all 3 variables on the same line. however I want to have some conditional statements. but I don't know how to do that. like do I just do it as you would normally do if it was just one variable or there's a specific way you have to do this ?

Answer 1

Note if conditions are wrong! it always evaluates to True:

 letter.strip() == "E" or "e":
 #                      ^^^^ always True  

should be:

 letter.strip() in ["E", "e"]:

Similar mistake is present in second if code.

Note: a Boolean equivalent of a non-empty string is always True eg

>>> bool("") # bool of empty string 
False
>>> bool(" ") # bool of non-empty string 
True
>>> bool("e")
True

So for this reason your if condition eg letter.strip() == "E" or "e": == letter.strip() == "E" or True: == Ture

As @ roippi is suggesting in comment, you can further simplify if conditional expressions just as follows:

letter.strip().lower() == 'e':