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/guido/switch.py
# Show how to do switchable panels.

from Tkinter import *

class App:

    def __init__(self, top=None, master=None):
        if top is None:
            if master is None:
                top = Tk()
            else:
                top = Toplevel(master)
        self.top = top
        self.buttonframe = Frame(top)
        self.buttonframe.pack()
        self.panelframe = Frame(top,  borderwidth=2, relief=GROOVE)
        self.panelframe.pack(expand=1, fill=BOTH)
        self.panels = {}
        self.curpanel = None

    def addpanel(self, name, klass):
        button = Button(self.buttonframe, text=name,
                        command=lambda self=self, name=name: self.show(name))
        button.pack(side=LEFT)
        frame = Frame(self.panelframe)
        instance = klass(frame)
        self.panels[name] = (button, frame, instance)
        if self.curpanel is None:
            self.show(name)

    def show(self, name):
        (button, frame, instance) = self.panels[name]
        if self.curpanel:
            self.curpanel.pack_forget()
        self.curpanel = frame
        frame.pack(expand=1, fill="both")

class LabelPanel:
    def __init__(self, frame):
        self.label = Label(frame, text="Hello world")
        self.label.pack()

class ButtonPanel:
    def __init__(self, frame):
        self.button = Button(frame, text="Press me")
        self.button.pack()

def main():
    app = App()
    app.addpanel("label", LabelPanel)
    app.addpanel("button", ButtonPanel)
    app.top.mainloop()

if __name__ == '__main__':
    main()

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