如何使此类接受int列表/元组作为参数？

问题描述

我尝试将从输入中获得的变量（作为整数的（x，y，z））成功地转换为元组和列表，但是我似乎无法让polynomial()与它们一起使用

from tkinter import *

class polynomial:

    def __init__(self,*coefficients):
        self.coefficients = list(coefficients)

    def __repr__(self):

        return "polynomial" + str(self.coefficients)

    def __call__(self,x):
        res = 0
        for index,coeff in enumerate(self.coefficients[::-1]):
            res += coeff * x ** index
        return res


def calculateIt():
    mathCoef = E1.get()
    botch = mathCoef
    mytuple = tuple(map(int,botch.split(',')))

    p = polynomial(mytuple)

    for x in range(-3,3):
       print(x,p(x))
    L1.configure(text=p)
    print(mathCoef)

window = Tk()
window.title("XImath Client 1.0")
window.configure(bg="black")
window.geometry("500x500")

L1 = Label(window,text="Input")
L1.pack()
E1 = Entry(window,bd=5)
E1.pack()

B1 = Button(window,text="go",command=calculateIt)
B1.pack()

window.mainloop()

问题是我希望class(polynomial)使用mathCoef中用户输入给定的变量，该变量最初是一个字符串。我尝试成功地将其转换为元组，但是class(polynomial)期望使用以下语法的整数-(1,2,3)。假设用户输入1,3-元组看起来完全像这样-(1,3)，但是当我尝试将其传递到polynomial(mytuple)时，它返回：

TypeError: unsupported operand type(s) for +=: 'int' and 'tuple'

如何将元组转换为以逗号分隔的整数？

解决方法

尝试以下代码。

我相信您可能缺少的是p = Polynomial(*coeffs)行中的*，它告诉python将列表解压缩为传递给类构造函数的参数。

我还向将多项式添加到标签的行中添加了repr(p)，这将向您显示该多项式的repr字符串。

from tkinter import *

class Polynomial:

    def __init__(self,*coefficients):
        self.coefficients = list(coefficients)

    def __repr__(self):

        return "Polynomial" + str(self.coefficients)

    def __call__(self,x):
        res = 0
        for index,coeff in enumerate(self.coefficients[::-1]):
            res += coeff * x ** index
        return res


def calculateIt():
    mathCoef = E1.get()
    coeffs = map(int,mathCoef.split(' '))

    p = Polynomial(*coeffs)

    for x in range(-3,3):
       print(x,p(x))
    L1.configure(text=repr(p))
    print(mathCoef)

window = Tk()
window.title("XImath Client 1.0")
window.configure(bg="black")
window.geometry("500x500")

L1 = Label(window,text="Input")
L1.pack()
E1 = Entry(window,bd=5)
E1.pack()

B1 = Button(window,text="go",command=calculateIt)
B1.pack()

window.mainloop()