import kivy
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from sympy import symbols, diff
 
kivy.require('2.0.0')  
 
class DerivativeApp(App):
    def build(self):
        x = symbols('x')
        self.function_input = TextInput(multiline=True)
        self.calculate_button = Button(text='求导数')
        self.result_label = Label(text='结果：')
        self.calculate_button.bind(on_press=self.calculate_derivative)
        box_layout = kivy.uix.boxlayout.BoxLayout(orientation='vertical')
        box_layout.add_widget(self.function_input)
        box_layout.add_widget(self.calculate_button)
        box_layout.add_widget(self.result_label)
 
        return box_layout
 
    def calculate_derivative(self, instance):
        function_str = self.function_input.text
        try:
            function_expr = sympy.sympify(function_str)
            derivative_expr = diff(function_expr, x)
            self.result_label.text = '结果：' + str(derivative_expr)
        except Exception as e:
            self.result_label.text = '错误：' + str(e)
 
if __name__ == '__main__':
    DerivativeApp().run()
#by lx

源地址：一键求导程序-CSDN博客