uestc-coursework-repo/python-Coursework/Calculator.py at master · LolipopJ/uestc-coursework-repo · GitHub

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from tkinter import *
from tkinter.ttk import *


def my_frame(master):
    w = Frame(master)
    w.pack(side=TOP, expand=YES, fill=BOTH)
    return w


def my_button(master, text, command):
    w = Button(master, text=text, command=command, width=6)
    w.pack(side=LEFT, expand=YES, fill=BOTH, padx=2, pady=2)
    return w


def back(text):
    if len(text) > 0:
        return text[:-1]
    else:
        return text


def calc(text):
    try:
        if sep_flag.get() == 0:
            return eval(del_sep(text))
        else:
            return add_sep(str(eval(del_sep(text))))
    except (SyntaxError, ZeroDivisionError, NameError):
        return 'Error'


def add_sep(text):
    #  如果已经添加了千位分隔符，则返回删除千位分隔符的文本
    added_index = text.find(',')
    if added_index > 0:
        return text.replace(',', '')

    #  如果没有添加，那么返回添加了千位分隔符的文本
    else:
        dot_index = text.find('.')
        if dot_index > 0:
            text_head = text[:dot_index]
            text_tail = text[dot_index:]
        elif dot_index < 0:
            text_head = text
            text_tail = ''
        else:
            text_head = ''
            text_tail = text
        list_ = [char for char in text_head]
        length = len(list_)
        tmp_index = 3
        while length-tmp_index > 0:
            list_.insert(length-tmp_index, ',')
            tmp_index += 3
        list_.extend(text_tail)
        new_text = ''
        for char in list_:
            new_text += char
        return new_text


def del_sep(text):
    return text.replace(',', '')


#  创建主窗口
wind = Tk()

#  设置主窗口样式
wind.title('计算器')
main_menu = Menu(wind)

#  创建'功能'菜单
calc_menu = Menu(main_menu, tearoff=0)
calc_menu.add_command(label='退出', command=lambda: exit())
main_menu.add_cascade(label='功能', menu=calc_menu)

#  创建'视图'菜单
text = StringVar()
sep_flag = IntVar()
sep_flag.set(0)
view_menu = Menu(main_menu, tearoff=0)
view_menu.add_checkbutton(label='显示千位分隔符', variable=sep_flag, command=lambda t=text: t.set(add_sep(t.get())))
main_menu.add_cascade(label='视图', menu=view_menu)
wind['menu'] = main_menu

#  创建文本框
Entry(wind, textvariable=text).pack(expand=YES, fill=BOTH, padx=2, pady=4)

#  创建Style对象
style = Style()
style.configure('TButton', padding=3)

#  创建第一行的按钮
fedit = my_frame(wind)
my_button(fedit, 'Backspace', lambda t=text: t.set(back(t.get())))
my_button(fedit, 'Clear', lambda t=text: t.set(''))
my_button(fedit, '±', lambda t=text: t.set('-('+t.get()+')'))

#  创建下面的按钮
for key in ('789/', '456*', '123-', '0.=+'):
    fsymb = my_frame(wind)
    for char in key:
        if char == '=':
            my_button(fsymb, char, lambda t=text: t.set(calc(t.get())))
        else:
            my_button(fsymb, char, lambda t=text, c=char: t.set(t.get()+c))

wind.mainloop()