基维的简单计算器问题

Question

我正在研究一个计算器，它根据你花了多少钱，月底你有多少钱来计算。

我会为你提供 .kv 和.py。问题是，我已经完成了视觉效果，并创建了包含数学的计算器类，现在我需要将其组合到一个正常运行的 GUI 应用程序中。

所以我想要实现的是，当您单击标有"izracunaj"的按钮时，该应用程序是计算器类（在"中），它应该接受用户输入并计算并返回结果。

main.py

import kivy
from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.image import Image
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.uix.textinput import TextInput
class Screen(GridLayout):
    def __init__(self, **kwargs):
        super(Screen, self).__init__(**kwargs)
        self.cols = 1
        self.add_widget(Label(text="Koliko imas na racunu"))
        self.stanjeNovaca = TextInput(multiline=False)
        self.add_widget(self.stanjeNovaca)
        self.add_widget(Label(text="Koliko dana do place"))
        self.stanjeDani = TextInput(multiline=False)
        self.add_widget(self.stanjeDani)
        self.add_widget(Label(text="Koliko trosis na dan"))
        self.stanjePotrosnja = TextInput(multiline=False)
        self.add_widget(self.stanjePotrosnja)
'''
class Calculator():
    def calculation():
        stanjeNovaca = input("Koliko imas para na racunu? ")
        stanjeDani = input("Koliko dana do place? ")
        stanjePotrosnja = input("koliko trosis na dan? ")
        svakiDanTrosis = stanjeDani*stanjePotrosnja
        naKrajuMjeseca = stanjeNovaca-svakiDanTrosis
        print("Ako svaki dan trosis {}, na kraju mjeseca ce ti ostati {}").format(stanjePotrosnja, naKrajuMjeseca)
        return calculation();
'''
class CalculatorApp(App):
  def build(self):
    return Screen()

CalculatorApp().run()

千伏

<Screen>
    Button:
        text: "izracunaj"

Answer 1

我修复了你的程序。kv-file中添加的命令会在您按下按钮时触发计算，结果将被打印出来。

main.py

import kivy
from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.image import Image
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.uix.textinput import TextInput
class Screen(GridLayout):
    def __init__(self, **kwargs):
        super(Screen, self).__init__(**kwargs)
        self.cols = 1
        self.add_widget(Label(text="Koliko imas na racunu"))
        self.stanjeNovaca = TextInput(multiline=False)
        self.add_widget(self.stanjeNovaca)
        self.add_widget(Label(text="Koliko dana do place"))
        self.stanjeDani = TextInput(multiline=False)
        self.add_widget(self.stanjeDani)
        self.add_widget(Label(text="Koliko trosis na dan"))
        self.stanjePotrosnja = TextInput(multiline=False)
        self.add_widget(self.stanjePotrosnja)
    def calculation(self):
        svakiDanTrosis = float(self.stanjeDani.text) * float(self.stanjePotrosnja.text)
        naKrajuMjeseca = float(self.stanjeNovaca.text) - svakiDanTrosis
        print("Ako svaki dan trosis {}, na kraju mjeseca ce ti ostati {}".format(self.stanjePotrosnja.text, naKrajuMjeseca))
        return naKrajuMjeseca
class CalculatorApp(App):
  def build(self):
    return Screen()

CalculatorApp().run()

计算器.kv

<Screen>
    Button:
        text: "izracunaj"
        on_release: root.calculation()

如果要在 GUI 中显示结果，只需在Screen中添加一个Widget（例如Label）并相应地设置其文本。

Answer 2

这个计算器看起来像暗模式下的Windows 10计算器

main.py（下）

from kivy.app import App
from kivy.uix.widget import Widget
from kivy.core.window import Window
from kivy.lang.builder import Builder
import re
Builder.load_file('./calculator.kv')
Window.size = (350, 550)
class CalculatorWidget(Widget):
    # Clear the screen
    def clear(self):
        self.ids.input_box.text = "0"
    # Remove the last character
    def remove_last(self):
        prev_number = self.ids.input_box.text
        prev_number = prev_number[:-1]
        self.ids.input_box.text = prev_number
    # Getting the button value
    def button_value(self, number):
        prev_number = self.ids.input_box.text
        if "wrong equation" in prev_number:
            prev_number = ''
        if prev_number == '0':
            self.ids.input_box.text = ''
            self.ids.input_box.text = f"{number}"
        else:
            self.ids.input_box.text = f"{prev_number}{number}"
    # Getting the sings
    def sings(self, sing):
        prev_number = self.ids.input_box.text
        self.ids.input_box.text = f"{prev_number}{sing}"
    # Getting decimal value
    def dot(self):
        prev_number = self.ids.input_box.text
        num_list = re.split("+|*|-|/|%", prev_number)
        if ("+" in prev_number or "-" in prev_number or "*" in prev_number or "/" in prev_number or "%" in prev_number) and "." not in num_list[-1]:
            prev_number = f"{prev_number}."
            self.ids.input_box.text = prev_number
        elif '.' in prev_number:
            pass
        else:
            prev_number = f'{prev_number}.'
            self.ids.input_box.text = prev_number
    # Calculate the result
    def results(self):
        prev_number = self.ids.input_box.text
        try:
            result = eval(prev_number)
            self.ids.input_box.text = str(result)
        except:
            self.ids.input_box.text = "wrong equation"
    # Positive to negative
    def positive_negative(self):
        prev_number = self.ids.input_box.text
        if "-" in prev_number:
            self.ids.input_box.text = f"{prev_number.replace('-', '')}"
        else:
            self.ids.input_box.text = f"-{prev_number}"

class CalculatorApp(App):
    def build(self):
        return CalculatorWidget()
if __name__ == "__main__":
    CalculatorApp().run()

在 .kv 文件中的代码下方

<Button>
    size_hint: (0.2, 0.2)
    background_normal: ""
    background_color: (0, 0, 0, 0)
<CalculatorWidget>
    BoxLayout
        orientation: "vertical"
        size: root.width, root.height
        TextInput:
            id: input_box
            text: "0"
            font_size: 43
            multiline: False
            halign: "right"
            size_hint: (1, 0.19)
            background_color: (20/255, 20/255, 30/255, 1)
            foreground_color: (1, 1, 1, 1)
        GridLayout:
            cols: 4
            rows: 5
            ### Row 1 ####
            Button:
                text: "%"
                font_size: 32
                on_press: root.sings("%")
                background_color: (14/255, 73/255, 176/255, 1)
            Button:
                text: "C"
                font_size: 32
                on_press: root.clear()
                background_color: (14/255, 73/255, 176/255, 1)
            Button:
                text: u"u00AB"
                font_size: 32
                on_press: root.remove_last()
                background_color: (14/255, 73/255, 176/255, 1)
            Button:
                text: "/"
                font_size: 32
                background_color: (14/255, 73/255, 176/255, 1)
                on_press: root.sings("/")
                background_color: (14/255, 73/255, 176/255, 1)
            #### Row 2 #####
            Button:
                text: "7"
                font_size: 32
                on_press: root.button_value(7)
            Button:
                text: "8"
                font_size: 32
                on_press: root.button_value(8)
            Button:
                text: "9"
                font_size: 32
                on_press: root.button_value(9)
            Button:
                text: "x"
                font_size: 32
                background_color: (14/255, 73/255, 176/255, 1)
                on_press: root.sings("*")
            #### Row 3 ###
            Button:
                text: "4"
                font_size: 32
                on_press: root.button_value(4)
            Button:
                text: "5"
                font_size: 32
                on_press: root.button_value(5)
            Button:
                text: "6"
                font_size: 32
                on_press: root.button_value(6)
            Button:
                text: "-"
                font_size: 32
                background_color: (14/255, 73/255, 176/255, 1)
                on_press: root.sings("-")
            ### Row 4 ###
            Button:
                text: "1"
                font_size: 32
                on_press: root.button_value(1)
            Button:
                text: "2"
                font_size: 32
                on_press: root.button_value(2)
            Button:
                text: "3"
                font_size: 32
                on_press: root.button_value(3)
            Button:
                text: "+"
                font_size: 32
                background_color: (14/255, 73/255, 176/255, 1)
                on_press: root.sings("+")
            ### Row 5 ###
            Button:
                text: "+/-"
                font_size: 32
                on_press: root.positive_negative()
            Button:
                text: "0"
                font_size: 32
                on_press: root.button_value(0)
            Button:
                text: "."
                font_size: 32
                on_press: root.dot()
            Button:
                text: "="
                font_size: 32
                background_color: (14/255, 73/255, 176/255, 1)
                on_press: root.results()