python PySimpleGUI 實現計算器

import PySimpleGUI as sg


class Button():

    def __init__(self, text, color=None, border=None):  # Setting Variable
        self.text = text
        self.color = color
        self.border = border

    def Create(self):  # Create Button
        return sg.ReadFormButton(self.text, button_color=self.color, border_width=self.border)


# Creat GUI       # Call Class from Class_Button.py
layout = [[sg.Txt('' * 10)],
          [sg.Text('', size=(15, 1), font=('Helvetica', 18), text_color='red', key='input')],
          [sg.Txt('' * 10)],
          [Button('(', ('black', 'orange')).Create(), Button(')', ('black', 'orange')).Create(),
           Button('c', ('black', 'orange')).Create(), Button('«', ('black', 'orange')).Create()],
          [Button('7', ('black', 'yellow')).Create(), Button('8', ('black', 'yellow')).Create(),
           Button('9', ('black', 'yellow')).Create(), Button('÷', ('black', 'orange')).Create()],
          [Button('4', ('black', 'yellow')).Create(), Button('5', ('black', 'yellow')).Create(),
           Button('6', ('black', 'yellow')).Create(), Button('x', ('black', 'orange')).Create()],
          [Button('1', ('black', 'yellow')).Create(), Button('2', ('black', 'yellow')).Create(),
           Button('3', ('black', 'yellow')).Create(), Button('-', ('black', 'orange')).Create()],
          [Button('.', ('black', 'orange')).Create(), Button('0', ('black', 'yellow')).Create(),
           Button('=', ('black', 'orange')).Create(), Button('+', ('black', 'orange')).Create()],
          ]

# Set PySimpleGUI
form = sg.FlexForm('13411_CALCULATOR', default_button_element_size=(5, 2), auto_size_buttons=False, grab_anywhere=False)
form.Layout(layout)

# Set Process
Equal = ''
List_Op_Error = ['+', '-', '*', '/', '(']

# Loop
while True:
    button, value = form.Read()  # call GUI

    # Press Button
    if button is 'c':
        Equal = ''
        form.FindElement('input').Update(Equal)
    elif button is '«':
        Equal = Equal[:-1]
        form.FindElement('input').Update(Equal)
    elif len(Equal) == 16:
        pass
    elif str(button) in '1234567890+-().':
        Equal += str(button)
        form.FindElement('input').Update(Equal)
    elif button is 'x':
        Equal += '*'
        form.FindElement('input').Update(Equal)
    elif button is '÷':
        Equal += '/'
        form.FindElement('input').Update(Equal)

    # Process Conditional
    elif button is '=':
        # Error Case
        for i in List_Op_Error:
            if '*' is Equal[0] or '/' is Equal[0] or ')' is Equal[0] or i is Equal[-1]:  # Check Error Case
                Answer = "Error Operation"
                break
            elif Equal == '6001012630187':
                Answer = 'Apisit.Khomcharoen'
                break
            elif '/0' in Equal or '*/' in Equal or '/*' in Equal:
                Answer = "Error Operation"
                break
            elif '(' in Equal:
                if ')' not in Equal:
                    Answer = "Error Operation"
                    break
            elif '(' not in Equal:
                if ')' in Equal:
                    Answer = "Error Operation"
                    break
        # Calculate Case
        else:
            Answer = str("%0.2f" % (eval(Equal)))  # eval(Equal)
            if '.0' in Answer:
                Answer = str(int(float(Answer)))  # convert float to int
        form.FindElement('input').Update(Answer)  # Update to GUI
        Equal = Answer

    elif button is 'Quit' or button is None:  # QUIT Program
        break

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