如何向 Flet 教程计算器项目添加第三个参数？

Question

我想在计算器示例中添加求解二次和三次方程的功能，我在如下所示的所有 3 个位置尝试了 operand3，但收到错误消息：argument 必须是字符串或实数，而不是“列表”，它只会显示终端中的输入，而不显示应用程序中的输入，任何人都可以帮助我，非常感谢，祝你有美好的一天

import flet as ft


class CalcButton(ft.ElevatedButton):
    def __init__(self, text, button_clicked, expand=1):
        super().__init__()
        self.text = text
        self.expand = expand
        self.on_click = button_clicked
        self.data = text


class DigitButton(CalcButton):
    def __init__(self, text, button_clicked, expand=1):
        CalcButton.__init__(self, text, button_clicked, expand)
        self.bgcolor = ft.colors.WHITE24
        self.color = ft.colors.WHITE


class ActionButton(CalcButton):
    def __init__(self, text, button_clicked):
        CalcButton.__init__(self, text, button_clicked)
        self.bgcolor = ft.colors.ORANGE
        self.color = ft.colors.WHITE


class ExtraActionButton(CalcButton):
    def __init__(self, text, button_clicked):
        CalcButton.__init__(self, text, button_clicked)
        self.bgcolor = ft.colors.BLUE_GREY_100
        self.color = ft.colors.BLACK


class CalculatorApp(ft.Container):
    # application's root control (i.e. "view") containing all other controls
    def __init__(self):
        super().__init__()
        self.reset()

        self.result = ft.Text(value="0", color=ft.colors.WHITE, size=20)
        self.width = 350
        self.bgcolor = ft.colors.BLACK
        self.border_radius = ft.border_radius.all(20)
        self.padding = 20
        self.content = ft.Column(
            controls=[
                ft.Row(controls=[self.result], alignment="end"),
                ft.Row(
                    controls=[
                        ExtraActionButton(
                            text="AC", button_clicked=self.button_clicked
                        ),
                        ExtraActionButton(
                            text="+/-", button_clicked=self.button_clicked
                        ),
                        ExtraActionButton(text="%", button_clicked=self.button_clicked),
                        ActionButton(text="/", button_clicked=self.button_clicked),
                    ]
                ),
                ft.Row(
                    controls=[
                        DigitButton(text="7", button_clicked=self.button_clicked),
                        DigitButton(text="8", button_clicked=self.button_clicked),
                        DigitButton(text="9", button_clicked=self.button_clicked),
                        ActionButton(text="*", button_clicked=self.button_clicked),
                    ]
                ),
                ft.Row(
                    controls=[
                        DigitButton(text="4", button_clicked=self.button_clicked),
                        DigitButton(text="5", button_clicked=self.button_clicked),
                        DigitButton(text="6", button_clicked=self.button_clicked),
                        ActionButton(text="-", button_clicked=self.button_clicked),
                    ]
                ),
                ft.Row(
                    controls=[
                        DigitButton(text="1", button_clicked=self.button_clicked),
                        DigitButton(text="2", button_clicked=self.button_clicked),
                        DigitButton(text="3", button_clicked=self.button_clicked),
                        ActionButton(text="+", button_clicked=self.button_clicked),
                    ]
                ),
                ft.Row(
                    controls=[
                        DigitButton(
                            text="0", expand=2, button_clicked=self.button_clicked
                        ),
                        DigitButton(text=".", button_clicked=self.button_clicked),
                        ActionButton(text="=", button_clicked=self.button_clicked),
                    ]
                ),
            ]
        )

    def button_clicked(self, e):
        data = e.control.data
        print(f"Button clicked with data = {data}")
        if self.result.value == "Error" or data == "AC":
            self.result.value = "0"
            self.reset()

        elif data in ("1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "."):
            if self.result.value == "0" or self.new_operand == True:
                self.result.value = data
                self.new_operand = False
            else:
                self.result.value = self.result.value + data

        elif data in ("+", "-", "*", "/"):
            self.result.value = self.calculate(
                self.operand1, float(self.result.value), self.operator
            )
            self.operator = data
            if self.result.value == "Error":
                self.operand1 = "0"
            else:
                self.operand1 = float(self.result.value)
            self.new_operand = True

        elif data in ("="):
            self.result.value = self.calculate(
                self.operand1, float(self.result.value), self.operator
            )
            self.reset()

        elif data in ("%"):
            self.result.value = float(self.result.value) / 100
            self.reset()

        elif data in ("+/-"):
            if float(self.result.value) > 0:
                self.result.value = "-" + str(self.result.value)

            elif float(self.result.value) < 0:
                self.result.value = str(
                    self.format_number(abs(float(self.result.value)))
                )

        self.update()

    def format_number(self, num):
        if num % 1 == 0:
            return int(num)
        else:
            return num

    def calculate(self, operand1, operand2, operator):

        if operator == "+":
            return self.format_number(operand1 + operand2)

        elif operator == "-":
            return self.format_number(operand1 - operand2)

        elif operator == "*":
            return self.format_number(operand1 * operand2)

        elif operator == "/":
            if operand2 == 0:
                return "Error"
            else:
                return self.format_number(operand1 / operand2)

    def reset(self):
        self.operator = "+"
        self.operand1 = 0
        self.new_operand = True


def main(page: ft.Page):
    page.title = "Calc App"
    # create application instance
    calc = CalculatorApp()

    # add application's root control to the page
    page.add(calc)


ft.app(target=main)

elif operator == "ax^2+bx+c=0":
    return selv.solv()
def solv():           
        a = float(input("Nhập a: "))
        b = float(input("Nhập b: "))
        c = float(input("Nhập c: "))    
        if a != 0:
            delta = b**2 - 4*a*c
            if delta > 0:
                x1 = (-b + delta**0.5) / (2*a)
                x2 = (-b - delta**0.5) / (2*a)
                return f"x1 = {x1}, x2 = {x2}"
            elif delta == 0:
                x = -b / (2*a)
                return f"x = {x}"
            else:
                return "Equation with no solution"
        else:
            return "Not a quadratic equation"

Answer 1

我想它会满足这样的需求：

import flet as ft

# ... (Your existing button classes)

class CalculatorApp(ft.Container):
    def __init__(self):
        super().__init__()
        self.reset()

        self.result = ft.Text(value="0", color=ft.colors.WHITE, size=20)

        self.input_a = ft.TextField(label="a", width=50)
        self.input_b = ft.TextField(label="b", width=50)
        self.input_c = ft.TextField(label="c", width=50)

        self.width = 350
        self.bgcolor = ft.colors.BLACK
        self.border_radius = ft.border_radius.all(20)
        self.padding = 20
        self.content = ft.Column(
            controls=[
                ft.Row(controls=[self.result], alignment="end"),
                # Quadratic solver inputs and button
                ft.Row(
                    controls=[
                        self.input_a,
                        self.input_b,
                        self.input_c,
                        ActionButton(text="Solve Quadratic", button_clicked=self.button_clicked, data="Solve Quadratic"),
                    ]
                ),
                # Existing calculator buttons...
            ]
        )

    def button_clicked(self, e):
        data = e.control.data
        print(f"Button clicked with data = {data}")

        if data == "AC":
            self.result.value = "0"
            self.reset()

        elif data == "Solve Quadratic":
            self.result.value = self.solve_quadratic()
            self.update()
            return

        # Existing code for digit and operation buttons...

        self.update()

    def solve_quadratic(self):
        try:
            a = float(self.input_a.value)
            b = float(self.input_b.value)
            c = float(self.input_c.value)
        except ValueError:
            return "Invalid input"

        if a == 0:
            return "Not a quadratic equation"

        delta = b**2 - 4*a*c

        if delta > 0:
            x1 = (-b + delta**0.5) / (2*a)
            x2 = (-b - delta**0.5) / (2*a)
            return f"x1 = {self.format_number(x1)}, x2 = {self.format_number(x2)}"
        elif delta == 0:
            x = -b / (2*a)
            return f"x = {self.format_number(x)}"
        else:
            return "No real solutions"

    def format_number(self, num):
        if num % 1 == 0:
            return int(num)
        else:
            return round(num, 4)

    def reset(self):
        self.operator = "+"
        self.operand1 = 0
        self.new_operand = True

# Rest of your code...

def main(page: ft.Page):
    page.title = "Calc App"
    calc = CalculatorApp()

    page.add(calc)

ft.app(target=main)