# _*_ coding:utf-8_*_

from Tkinter import *

def submit(ev = None):

p.set(u.get())

root = Tk()

root.title("测试")

frame = Frame(root)

frame.pack(padx=8, pady=8, ipadx=4)

lab1 = Label(frame, text="获取:")

lab1.grid(row=0, column=0, padx=5, pady=5, sticky=W)

#绑定对象到Entry

u = StringVar()

ent1 = Entry(frame, textvariable=u)

ent1.grid(row=0, column=1, sticky='ew', columnspan=2)

lab2 = Label(frame, text="显示:")

lab2.grid(row=1, column=0, padx=5, pady=5, sticky=W)

p = StringVar()

ent2 = Entry(frame, textvariable=p)

ent2.grid(row=1, column=1, sticky='ew', columnspan=2)

button = Button(frame, text="输入", command=submit, default='active')

button.grid(row=2, column=1)

lab3 = Label(frame, text="")

lab3.grid(row=2, column=0, sticky=W)

button2 = Button(frame, text="退出", command=quit)

button2.grid(row=2, column=2, padx=5, pady=5)

#以下代码居中显示窗口

root.update_idletasks()

x = (root.winfo_screenwidth() - root.winfo_reqwidth()) / 2

y = (root.winfo_screenheight() - root.winfo_reqheight()) / 2

root.geometry("+%d+%d" % (x, y))

#以下代码把回车绑定到对象Entry,这样输入完后按回车键就可以看到文字出现在另一个文本框中了。

ent1.bind("", submit) #注意这里是Return而不是Enter

#root.bind("", submit) #这句把回车绑定到窗口,无论光标在哪按回车会把文本复制

root.mainloop()

rt = Tk()

ent = Entry(rt)

ent.pack()

rt.mainloop()