Question

我相对较新的编程，但熟悉python的基本概念。我的问题是：我做了一个程序，它接受2个输入，检查它们长度小于8位，只包含1和0。一旦它接收并验证了它的2个二进制输入，它就将它们都转换为否定并将它们加在一起得到总数。一旦计算出总数，它就会将其转换回二进制并显示它。我有所有的计算和输出工作，但第一点是让我麻烦。我想把输入的所有验证都放到一个循环中，所以当条件不满足时，它继续要求输入并且不允许接受任何不是8位二进制形式的输入。我已经尝试了很多天了，最后决定在这里寻求专家的帮助：P希望有人可以帮助我，我将非常感谢我对循环的进一步了解。谢谢你，我现在的代码：）

valid = 0
while valid == 0 or correctcharacter == 0:
    firstnumber = input("First number is...")
    valid = 1
    correctcharacter = 0
    while correctcharacter == 0:
        correctcharacter = 1
        for number in firstnumber:
            if number != "0" and number != "1":
                valid = 0
                correctcharacter = 0

                if len(firstnumber) > 8:
                    valid = 0
#_________________________________________________________________________________________________________
valid = 0
while valid == 0:
    secondnumber = input("Second number is...")
    valid = 1
    correctcharacter = 0
    while correctcharacter == 0:
        correctcharacter = 1
        for number in secondnumber:
            if number != "0" and number != "1":
                valid = 0
                correctcharacter = 0

                if len(secondnumber) > 8:
                    valid = 0
#_________________________________________________________________________________________________________
multiple = 1
final1 = 0

for number in firstnumber[::-1]:
    final1 = final1 + int(number) * multiple
    multiple = multiple * 2

multiple = 1
final2 = 0

for number in secondnumber[::-1]:
    final2 = final2 + int(number) * multiple
    multiple = multiple * 2
#_________________________________________________________________________________________________________
total = final1 + final2

number = total
output = str()

while number > 0:
    output = str(number % 2) + output
    number = int(number / 2)

print("")
print("The total of {} and {} is {}.".format(firstnumber, secondnumber, output))

Answer 1

以防万一其他人需要帮助，这就是我解决问题的方法： http://docs.python.org/2/library/re.html

import re
valid = 0

while valid == 0:
    valid = 1
    firstnumber = input("Please enter firstnumber... ")
    if not re.match("^[0-1]{1,8}$", firstnumber):
        valid = 0
        print("Error! This program only accepts up to 8 0s and 1s!")

Python - Binary Addition，Loop无效

1 个答案: