在 python 中使用条件错误

Question

我的二次计算程序需要帮助。我在 If 中使用了一个表达式，该表达式显然会导致数学错误。但是我不希望代码在错误发生时崩溃，而是希望发生其他事情。

import math


def quad(a, b, c):
    # creating a variable for all the parts that make the expression
    first_nu = int(a)
    second_nu = int(b)
    third_nu = int(c)
    four = 4
    two = 2
    det = second_nu ** 2 - (four * (first_nu * third_nu))

    if math.sqrt(det) == 0:
        print(' the discriminant is 0 hence the quadratic has no real roots')
    else:

        # calculating the roots
        root_det = math.sqrt(det)

        def printing():
            option1 = (-third_nu + root_det) / (two * first_nu)
            option2 = (-third_nu - root_det) / (two * first_nu)
            print(option1, option2)

        if det < 0:
            printing()
            print('The roots are not real roots')
        elif det == 0:
            print('mathematical error in a situation where there is root of 0')
            print('The roots has just one real root')
        elif det > 0:
            printing()
            print('The roots has two real roots')


first_num = input("enter your first number of the quadratic")
second_num = input("enter your second number of the quadratic")
third_num = input("enter your third number of the quadratic")

quad(first_num, second_num, third_num)

Answer 1

对要测试的代码使用try:，并将其余代码放在except中。我希望这能解决问题。 For more information about Python error handling here or check from w3schools

try 块可让您测试代码块的错误。

except 块可让您处理错误。

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