简易版计算器

# 简易版计算器
import tkinter as tk
from tkinter import messagebox

root = tk.Tk()
root.title('计算器')
root.geometry('315x310+100+100')
root.attributes('-alpha', 0.9)  # 设置透明度
# root.config(background='#FFFFFF')
root.resizable(width=False, height=False)
font = ('宋体', 24)
font_18 = ('宋体', 18)


def show_author():
    prt_str = 'Author: maked by yx迈克\nDate: 2022年4月9日'
    messagebox.showinfo(title='关于作者', message=prt_str)


def about():
    prt_str = '此款计算器是简易版的计算器，仅可计算加减乘除。\n版本号：V1.0'
    messagebox.showinfo(title='关于计算器', message=prt_str)


menu = tk.Menu(root)
about_menu = tk.Menu(menu, tearoff=False)
about_menu.add_command(label='作者', command=show_author)
about_menu.add_command(label='关于', command=about)
menu.add_cascade(label='帮助', menu=about_menu)
root.config(menu=menu)  # 一定要加这句，否则菜单就不会展现出来

# 以下是计算器按钮页面
result_num = tk.StringVar()
result_num.set('')
result_lbl = tk.Label(root, textvariable=result_num, font=font, height=2, wraplength=300,
                      width=19, justify=tk.LEFT, anchor=tk.SE)
result_lbl.grid(row=1, column=1, columnspan=4)

button_clear = tk.Button(root, text='C', font=font_18, width=5, bg='#b1b2b2', relief=tk.FLAT)
button_back = tk.Button(root, text='←', font=font_18, width=5, bg='#b1b2b2', relief=tk.FLAT)
button_divsion = tk.Button(root, text='/', font=font_18, width=5, bg='#b1b2b2', relief=tk.FLAT)
button_mulitplation = tk.Button(root, text='*', font=font_18, width=5, bg='#b1b2b2', relief=tk.FLAT)
button_clear.grid(row=2, column=1, padx=4, pady=2)
button_back.grid(row=2, column=2, padx=4, pady=2)
button_divsion.grid(row=2, column=3, padx=4, pady=2)
button_mulitplation.grid(row=2, column=4, padx=4, pady=2)

button_seven = tk.Button(root, text='7', font=font_18, width=5, bg='#EECD9F', relief=tk.FLAT)
button_eight = tk.Button(root, text='8', font=font_18, width=5, bg='#EECD9F', relief=tk.FLAT)
button_nine = tk.Button(root, text='9', font=font_18, width=5, bg='#EECD9F', relief=tk.FLAT)
button_substraction = tk.Button(root, text='-', font=font_18, width=5, bg='#b1b2b2', relief=tk.FLAT)
button_seven.grid(row=3, column=1, padx=4, pady=2)
button_eight.grid(row=3, column=2, padx=4, pady=2)
button_nine.grid(row=3, column=3, padx=4, pady=2)
button_substraction.grid(row=3, column=4, padx=4, pady=2)

button_four = tk.Button(root, text='4', font=font_18, width=5, bg='#EECD9F', relief=tk.FLAT)
button_five = tk.Button(root, text='5', font=font_18, width=5, bg='#EECD9F', relief=tk.FLAT)
button_six = tk.Button(root, text='6', font=font_18, width=5, bg='#EECD9F', relief=tk.FLAT)
button_addition = tk.Button(root, text='+', font=font_18, width=5, bg='#b1b2b2', relief=tk.FLAT)
button_four.grid(row=4, column=1, padx=4, pady=2)
button_five.grid(row=4, column=2, padx=4, pady=2)
button_six.grid(row=4, column=3, padx=4, pady=2)
button_addition.grid(row=4, column=4, padx=4, pady=2)

button_one = tk.Button(root, text='1', font=font_18, width=5, bg='#EECD9F', relief=tk.FLAT)
button_two = tk.Button(root, text='2', font=font_18, width=5, bg='#EECD9F', relief=tk.FLAT)
button_three = tk.Button(root, text='3', font=font_18, width=5, bg='#EECD9F', relief=tk.FLAT)
button_equal = tk.Button(root, text='=', font=font_18, width=5, height=3, bg='#b1b2b2', relief=tk.FLAT)
button_one.grid(row=5, column=1, padx=4, pady=2)
button_two.grid(row=5, column=2, padx=4, pady=2)
button_three.grid(row=5, column=3, padx=4, pady=2)
button_equal.grid(row=5, column=4, padx=4, pady=2, rowspan=2)

button_zero = tk.Button(root, text='0', font=font_18, width=12, bg='#EECD9F', relief=tk.FLAT)
# button_zero1 = tk.Button(root,text='0',font=font_18,width=5,bg='#EECD9F',relief=tk.FLAT)
button_dot = tk.Button(root, text='.', font=font_18, width=5, bg='#EECD9F', relief=tk.FLAT)
# button_equal1 = tk.Button(root,text='=',font=font_18,width=5,bg='#b1b2b2',relief=tk.FLAT)
button_zero.grid(row=6, column=1, padx=4, pady=2, columnspan=2)
# button_zero1.grid(row=6,column=2,padx=4,pady=2)
button_dot.grid(row=6, column=3, padx=4, pady=2)
# button_equal1.grid(row=6,column=4,padx=4,pady=2)

"""点击事件"""


def click_btn(x):
    # print('x:{}'.format(x))
    result_num.set(result_num.get() + x)


def caculate():
    res_str = result_num.get()
    result = eval(res_str)
    result_num.set(result)


def clear():
    result_num.set('')


def back():
    res = result_num.get()
    if len(res):
        res = res[:-1]
    result_num.set(res)


button_one.config(command=lambda: click_btn('1'))  # 匿名函数，传参数
button_two.config(command=lambda: click_btn('2'))
button_three.config(command=lambda: click_btn('3'))
button_four.config(command=lambda: click_btn('4'))
button_five.config(command=lambda: click_btn('5'))
button_six.config(command=lambda: click_btn('6'))
button_seven.config(command=lambda: click_btn('7'))
button_eight.config(command=lambda: click_btn('8'))
button_nine.config(command=lambda: click_btn('9'))
button_zero.config(command=lambda: click_btn('0'))
button_addition.config(command=lambda: click_btn('+'))
button_substraction.config(command=lambda: click_btn('-'))
button_mulitplation.config(command=lambda: click_btn('*'))
button_divsion.config(command=lambda: click_btn('/'))
button_dot.config(command=lambda: click_btn('.'))
button_equal.config(command=caculate)
button_clear.config(command=clear)
button_back.config(command=back)

root.mainloop()