import tkinter as tk
import time
window = tk.Tk()
window.title("简易计算器")
window.geometry('300x400')
content = ''
def btn_onclick(data):
    global content
    if data=="AC" or data =="MC":
        expression.set('')
        result.set('')
        content =''
    elif data == '=':
        result.set(f'{round(eval(content),5)}')
    else:
        content+=data
        expression.set(content)


#___________________________________________
lable_time_text = tk.Label(window,text="您好，北京时间：",font=("楷体",15))
lable_time_text.place(x=0,y=100,width=180,height=30)
gettime = tk.StringVar(value=(time.strftime("%H:%M:%S",time.localtime(time.time()))))

lable_time = tk.Label(window,textvariable=gettime,font=("楷体",15))
lable_time.place(x=180,y=100,width=100,height=30)
#_____________________________________________

btn_datas =[
    ["AC"," ","/","%"],
    ["7","8","9","*"],
    ["4","5","6","-"],
    ["1","2","3","+"],
    ["MC","0",".","="]
]

# command=lambda x=btn_datas[r][c]:btn_onclick(x)
for r in range(5):
    for c in range(4):
        btn_submit=tk.Button(window,text=btn_datas[r][c],font=("楷体",15),command=lambda x=btn_datas[r][c]:btn_onclick(x))
        btn_submit.place(x=c*72+6,y=r*50+140,width=70,height=50)
#------------------------------------------------
frame = tk.Frame(window,bd=2,relief="sunken")
frame.place(x=10,y=10,width=270,height=30)
expression = tk.StringVar( )
lable_express_text = tk.Label(frame,textvariable=expression,font=("楷体",15))
lable_express_text.place(x=0,y=0,width=270,height=30)

lable_result_text = tk.Label(window,text="计算结果：",font=("楷体",15))
lable_result_text.place(x=0,y=50,width=150,height=30)
result = tk.StringVar(value='0')
lable_result_content = tk.Label(window,textvariable=result,font=("楷体",15))
lable_result_content.place(x=150,y=50,width=100,height=30)



#______________________________________________________
window.mainloop()