Question

我正在制作一个可以转换数字存储单元的程序。就像，你可以问它有多少比特是x量的兆比特。我只是用一个if语句对它进行测试，但我无法打印答案。

import re

UNITS = ["bit", "byte", "exabit", "exabyte", "gigabit", "gigabyte", 
"kilobit", "kilobyte", "megabit", "megabyte", "petabit", "petabyte", 
"terabit", "terabyte"]

PLURAL_UNITS = ["bits", "bytes", "exabits", "exabytes", "gigabits", 
"gigabytes", "kilobits", "kilobytes", "megabits", "megabytes", "petabits", 
"petabytes", "terabits", "terabytes"]

PROMPT_1 = "How many "
PROMPT_2 = "are in "

def convert():
    first_unit = raw_input(PROMPT_1)
    second_unit = raw_input(PROMPT_2)

    number_of = re.findall('\d+', second_unit)

    number = number_of[0]

    if first_unit == PLURAL_UNITS[0] and second_unit == " " + PLURAL_UNITS[1]:
        answer = float(number)*8
        print(answer)


convert()

Answer 1

看看这一行：

if first_unit == PLURAL_UNITS[0] and second_unit == " " + PLURAL_UNITS[1]:

使用此行，只有在第一个输入为"bits"且第二个输入为" bytes"时，才会打印代码。输入任何其他内容会使if语句（包括您的print）下的代码被跳过。

Answer 2

它没有打印，因为它没有达到您的print声明。您if声明的一个或两个条件是False。要检查哪个，打印他们的结果：

def convert():
    first_unit = raw_input(PROMPT_1)
    second_unit = raw_input(PROMPT_2)

    number_of = re.findall('\d+', second_unit)

    number = number_of[0]

    print('first check:', first_unit == PLURAL_UNITS[0])
    print('second check:', second_unit == " " + PLURAL_UNITS[1])
    if first_unit == PLURAL_UNITS[0] and second_unit == " " + PLURAL_UNITS[1]:
        answer = float(number)*8
        print(answer)


convert()

Answer 3

在python2中，print是一个语句，而不是一个函数。打印答案

Python 2.7打印出现问题

3 个答案: