Question

如果用户输入了'tea'或't'作为选择，我如何将变量beverage.lower()定义为'tea'？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？

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，我将如何将输入的beverage.lower()用户定义为另一个变量？

Answer 1

您的代码在流控制（if块）和值分配（==和=）中遇到各种问题。经过一些更改后，就在这里。并尽量不要混合使用4个空格的制表符和8个空格的制表符。始终坚持使用 PEP8

中的4个空格标签

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!)

Answer 2

只需使用变量来赋值：

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

分配另一个变量：

input_var = None
beverage=raw_input("What is your preferred beverage: coffee, or tea?")
if beverage.lower()=='t'or beverage.lower()=='tea':
    input_var = 'tea'

print 'Input value: ', input_var

Answer 3

如果要修改变量beverage=beverage.lower()的值，可以使用语句beverage。

从您的问题中我相信那是您的疑问。

Answer 4

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

以上声明无效，因为您已经这样写。 如果没有输入（'coffee'，'tea'，'t'，'c'），则绝对没有机会进入上述代码。

您需要将if beverage.lower() not in ('coffee','tea','t','c'):替换为

if beverage.lower() in ('coffee','tea','t','c'):

此外，您还需要在if条件中将beverage.lower()=='tea'替换为beverage.lower()='tea'

Answer 5

在分配值“ tea”或“ t”时，您犯了一个小错误。它应该像- Drink ='tea'而不是drink.lower（）=='tea'

定义变量

5 个答案: