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bad operand type

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我要快乐和寻找梦想

#1 Created at ... [Delete] [Delete and Lock User] 
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import math
def quadratic(a,b,c):
    d=b*b-4*a*c
    if not isinstance((a,b,c),(int,float)):
        raise TypeError('bad operand type')  
    if a==0:
        if b==0:
            return '该方程无解'
        else:
            x=-c/b
            return x
    elif d<0:
        return '该方程无解'
    else:
        x1=(-b+math.sqrt(d))/(2*a)
        x2=(-b-math.sqrt(d))/(2*a)
        return x1,x2

请问这个if not isinstance((a,b,c),(int,float)): raise TypeError('bad operand type') 这一句哪里有问题吗，总是错？

出走的電燈泡泡泡泡泡泡泡兒

#2 Created at ... [Delete] [Delete and Lock User] 
在此插入代码

if not (isinstance(a, (int, float)) or isinstance(b, (int, float)) or isinstance(c, (int, float))): raise TypeError('bad operand type')

你试试这个

出走的電燈泡泡泡泡泡泡泡兒

#3 Created at ... [Delete] [Delete and Lock User]

isinstance（变量obj，（数据类型1，数据类型2...） 变量一次只能判断一个是否为以下数据类型，而不能同时判断多个变量吧

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