我有一个简单的计算器，它有一个固定常数和另一个要添加到常数中的条目。我正在努力处理这些项（变量）为负的ie-1234，因为我在输入上强制转换了int（），这很明显会导致在尝试计算总和时出现问题。

import PySimpleGUI as sg

columns = ["FIXED","VARIABLE","RESULT"]
param = (20,3) # size of the main window

def CALCULATOR():
    sg.theme('Dark Brown 1')
    listing = [sg.Text(u, size = param) for u in columns]
    core = [
    sg.Input(f"{10}", size = param),
    sg.Input(size = param,enable_events=True,key='NUMBER'),
    sg.Input(size = param)]

    mesh = [[x,y] for (x,y) in list(zip(listing, core))]
    window = sg.Window('CALCULATOR', mesh, font='Courier 12').Finalize()
    while True:
        event, values = window.read()
        if event == sg.WINDOW_CLOSED:
            break
        elif event == "SEND":
            break
        elif event == "NUMBER":
            variable = int(values['NUMBER'])
            fixed= int(values[0])
            for element, value in zip(core[2:], [variable+fixed]):
               element.update(value=value)
        else:
            print("OVER")
    window.close()
CALCULATOR()