kivy小程序——计算器

from kivy.app import App from kivy.core import window from kivy.uix.widget import Widget from kivy.properties import ObjectProperty from kivy.lang import Builder from kivy.core.window import Window Window.size = 500, 700 Builder.load_string(""" <MyLayout>: BoxLayout: orientation: 'vertical' size:root.width,root.height TextInput: id:calc_input text:"0" font_name:"./SIMLI.TTF" halign:"right" font_size: 65 size_hint: 1, .15 GridLayout: cols:4 rows:5 Button: size_hint: .2, .2 font_size:32 text:"%" font_name:"./SIMLI.TTF" Button: size_hint: .2, .2 font_size:32 text:"C" font_name:"./SIMLI.TTF" on_press:root.clear() Button: id:clear size_hint: .2, .2 font_size:32 text:"<<" font_name:"./SIMLI.TTF" on_press:root.remove() Button: size_hint: .2, .2 font_size:32 text:"/" font_name:"./SIMLI.TTF" on_press:root.math_sign("/") Button: size_hint: .2, .2 font_size:32 text:"7" font_name:"./SIMLI.TTF" background_color:157/255, 157/255, 157/255,1 on_press:root.button_press(7) Button: size_hint: .2, .2 font_size:32 text:"8" font_name:"./SIMLI.TTF" background_color:157/255, 157/255, 157/255,1 on_press:root.button_press(8) Button: size_hint: .2, .2 font_size:32 text:"9" font_name:"./SIMLI.TTF" background_color:157/255, 157/255, 157/255,1 on_press:root.button_press(9) Button: size_hint: .2, .2 font_size:32 text:"x" font_name:"./SIMLI.TTF" on_press:root.math_sign("*") Button: size_hint: .2, .2 font_size:32 text:"4" font_name:"./SIMLI.TTF" background_color:157/255, 157/255, 157/255,1 on_press:root.button_press(4) Button: size_hint: .2, .2 font_size:32 text:"5" font_name:"./SIMLI.TTF" background_color:157/255, 157/255, 157/255,1 on_press:root.button_press(5) Button: size_hint: .2, .2 font_size:32 text:"6" font_name:"./SIMLI.TTF" background_color:157/255, 157/255, 157/255,1 on_press:root.button_press(6) Button: size_hint: .2, .2 font_size:32 text:"-" font_name:"./SIMLI.TTF" on_press:root.math_sign("-") Button: size_hint: .2, .2 font_size:32 text:"1" font_name:"./SIMLI.TTF" background_color:157/255, 157/255, 157/255,1 on_press:root.button_press(1) Button: size_hint: .2, .2 font_size:32 text:"2" font_name:"./SIMLI.TTF" background_color:157/255, 157/255, 157/255,1 on_press:root.button_press(2) Button: size_hint: .2, .2 font_size:32 text:"3" font_name:"./SIMLI.TTF" background_color:157/255, 157/255, 157/255,1 on_press:root.button_press(3) Button: size_hint: .2, .2 font_size:32 text:"+" font_name:"./SIMLI.TTF" on_press:root.math_sign("+") Button: size_hint: .2, .2 font_size:32 text:"+/-" font_name:"./SIMLI.TTF" background_color:157/255, 157/255, 157/255,1 on_press:root.pos_neg() Button: size_hint: .2, .2 font_size:32 text:"0" font_name:"./SIMLI.TTF" background_color:157/255, 157/255, 157/255,1 on_press:root.button_press(0) Button: size_hint: .2, .2 font_size:32 text:"." font_name:"./SIMLI.TTF" background_color:157/255, 157/255, 157/255,1 on_press:root.dot() Button: size_hint: .2, .2 font_size:32 text:"=" font_name:"./SIMLI.TTF" on_press:root.equals() """ ) class MyLayout(Widget): def clear(self): self.ids.calc_input.text = '0' def button_press(self, button): prior = self.ids.calc_input.text if "Error" in prior: prior = '' if prior == "0": self.ids.calc_input.text = '' self.ids.calc_input.text = f'{button}' else: self.ids.calc_input.text = f'{prior}{button}' def remove(self): prior = self.ids.calc_input.text prior = prior[:-1] self.ids.calc_input.text = prior def dot(self): prior = self.ids.calc_input.text num_list = prior.split("+") if "+" in prior and "." not in num_list[-1]: prior = f'{prior}.' self.ids.calc_input.text = prior elif "." in prior: pass else: prior = f'{prior}.' self.ids.calc_input.text = prior def math_sign(self, sign): prior = self.ids.calc_input.text self.ids.calc_input.text = f'{prior}{sign}' def equals(self): prior = self.ids.calc_input.text try: answer = eval(prior) self.ids.calc_input.text = str(answer) except: self.ids.calc_input.text = 'Error' """if "+" in prior: num_list = prior.split("+") answer = 0 for number in num_list: answer = answer+float(number) self.ids.calc_input.text = str(answer)""" def pos_neg(self): prior = self.ids.calc_input.text if "-" in prior: self.ids.calc_input.text = f'{prior.replace("-", "")}' else: self.ids.calc_input.text = f'-{prior}' class CalculatorApp(App): def build(self): return MyLayout() if __name__ == '__main__': CalculatorApp().run()