晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //lib64/python2.7/Demo/tkinter/matt/entry-with-shared-variable.py
from Tkinter import *
import string

# This program  shows how to make a typein box shadow a program variable.

class App(Frame):
    def __init__(self, master=None):
        Frame.__init__(self, master)
        self.pack()

        self.entrythingy = Entry(self)
        self.entrythingy.pack()

        self.button = Button(self, text="Uppercase The Entry",
                             command=self.upper)
        self.button.pack()

        # here we have the text in the entry widget tied to a variable.
        # changes in the variable are echoed in the widget and vice versa.
        # Very handy.
        # there are other Variable types. See Tkinter.py for all
        # the other variable types that can be shadowed
        self.contents = StringVar()
        self.contents.set("this is a variable")
        self.entrythingy.config(textvariable=self.contents)

        # and here we get a callback when the user hits return. we could
        # make the key that triggers the callback anything we wanted to.
        # other typical options might be <Key-Tab> or <Key> (for anything)
        self.entrythingy.bind('<Key-Return>', self.print_contents)

    def upper(self):
        # notice here, we don't actually refer to the entry box.
        # we just operate on the string variable and we
        # because it's being looked at by the entry widget, changing
        # the variable changes the entry widget display automatically.
        # the strange get/set operators are clunky, true...
        str = string.upper(self.contents.get())
        self.contents.set(str)

    def print_contents(self, event):
        print "hi. contents of entry is now ---->", self.contents.get()

root = App()
root.master.title("Foo")
root.mainloop()

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