python - 定义变量

Question

如果用户输入了 'tea' 或 't' 作为他们的选择，我该如何定义变量 beverage.lower() 作为 “茶”？因为

if beverage.lower()=='t'or beverage.lower()=='tea':
                beverage.lower()=='tea'

line 对整个程序本身绝对没有任何影响吗？

while True:
        beverage=raw_input("What is your preferred beverage: coffee, or tea?")
        if beverage.lower() not in ('coffee','tea','t','c'):
            if beverage.lower()=='t'or beverage.lower()=='tea':
                beverage.lower()=='tea'
            elif beverage.lower()=='c'or beverage.lower()=='coffee':
                beverage.lower()=='coffee'
            print("Sorry! I didn't quite catch that. Please try again! (Note that you can use the letter 'c' or the letter 't' to denote coffee or tea respectively!)")
            continue
        else:
            print("Ah! Fantastic choice!")
            break

同样，我将如何将用户输入的 beverage.lower() 定义为另一个变量？

Answer 1

您的代码在流控制(if block )和值分配(== 和 =)方面存在各种问题。经过一些改动后，就是这样了。并且尽量不要混用 4 个空格的制表符和 8 个空格的制表符。始终坚持使用 4 个空格制表符，因为它是 PEP8

的标准

while True:
    beverage = input("What is your preferred beverage: coffee, or tea?").lower() # much efficient to .lower() only once
    if beverage in ('coffee','tea','t','c'): # Change this to 'in'
        if beverage == 't' or beverage == 'tea':
            beverage = 'tea' # value assignments are done with = not ==
        elif beverage == 'c' or beverage == 'coffee':
            beverage = 'coffee' # value assignments are done with = not ==
        print('Ah! Fantastic choice!')
        print('You have chosen {}'.format(beverage))
    else:
        print("Sorry! I didn't quite catch that. Please try again! (Note that you can use the letter 'c' or the letter 't' to denote coffee or tea respectively!)")

O/P:

What is your preferred beverage: coffee, or tea?c
Ah! Fantastic choice!
You have chosen coffee
What is your preferred beverage: coffee, or tea?t
Ah! Fantastic choice!
You have chosen tea
What is your preferred beverage: coffee, or tea?x
Sorry! I didn't quite catch that. Please try again! (Note that you can use the letter 'c' or the letter 't' to denote coffee or tea respectively!)