初学Python tkinter，利用目前所学编写一个简单的计算器练习一下。
预期效果：
1.能够实现加减乘除运算，
2.只能输入数字
3.通过按钮选择进行哪种运算。
4.结果框不能修改，智能复制
5.按清除按钮能够清除所有内容
from tkinter import *
count = Tk()
count.title("纯醪八盅@计算器")
def clear():
v1.set("")
v2.set("")
v3.set("")
def calc():
print(v1.get(),v2.get())
print(v4.get())
if v4.get()=="+":
result = int(v1.get()) + int(v2.get())
elif v4.get()=="-":
result = int(v1.get()) - int(v2.get())
elif v4.get()=="x":
result = int(v1.get()) * int(v2.get())
else:
result = int(v1.get()) / int(v2.get())
v3.set(result)
def test(content):
return content.isdigit()
frame = Frame(count)
frame.pack(padx=10,pady=10)
v1=StringVar()
v2=StringVar()
v3=StringVar()
testEnt = count.register(test)
entry_1 = Entry(frame,width = 10,textvariable=v1,validate="key",validatecommand=(testEnt,"%P"))#
entry_1.grid(row=0,column=0,padx=5,pady=5)
v4=StringVar()
v4.set("+")
label = Label(frame,textvariable=v4).grid(row=0,column=1,padx=5,pady=5)
entry_2 = Entry(frame,width = 10,textvariable=v2,validate="key",validatecommand=(testEnt,"%P"))
entry_2.grid(row=0,column=2,padx=5,pady=5)
label2 = Label(frame,text="=").grid(row=0,column=3,padx=5,pady=5)
entry_3 = Entry(frame,width = 10,textvariable=v3,state ="readonly")#显示结果的区域只读，不可修改
entry_3.grid(row=0,column=4,padx=5,pady=5)
def set1():
v4.set("+")
def set2():
v4.set("-")
def set3():
v4.set("x")
def set4():
v4.set("/")
button1 = Button(frame,text="+",command = set1).grid(row=1,column=1,padx=5,pady=5)
button2 = Button(frame,text="-",command = set2).grid(row=1,column=2,padx=5,pady=5)
button3 = Button(frame,text="x",command = set3).grid(row=1,column=3,padx=5,pady=5)
button4 = Button(frame,text="/",command = set4).grid(row=1,column=4,padx=5,pady=5)
button5 = Button(frame,text="清空",command = clear).grid(row=2,column=1,padx=5,pady=5)
button6 = Button(frame,text="=",command=calc).grid(row=2,column=3,padx=5,pady=5)
mainloop()效果截图：
