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 : //usr/lib64/python2.7/Demo/tkinter/ttk/theme_selector.py
"""Ttk Theme Selector v2.

This is an improvement from the other theme selector (themes_combo.py)
since now you can notice theme changes in Ttk Combobox, Ttk Frame,
Ttk Label and Ttk Button.
"""
import Tkinter
import ttk

class App(ttk.Frame):
    def __init__(self):
        ttk.Frame.__init__(self, borderwidth=3)

        self.style = ttk.Style()

        # XXX Ideally I wouldn't want to create a Tkinter.IntVar to make
        #     it works with Checkbutton variable option.
        self.theme_autochange = Tkinter.IntVar(self, 0)
        self._setup_widgets()

    def _change_theme(self):
        self.style.theme_use(self.themes_combo.get())

    def _theme_sel_changed(self, widget):
        if self.theme_autochange.get():
            self._change_theme()

    def _setup_widgets(self):
        themes_lbl = ttk.Label(self, text="Themes")

        themes = self.style.theme_names()
        self.themes_combo = ttk.Combobox(self, values=themes, state="readonly")
        self.themes_combo.set(themes[0])
        self.themes_combo.bind("<<ComboboxSelected>>", self._theme_sel_changed)

        change_btn = ttk.Button(self, text='Change Theme',
            command=self._change_theme)

        theme_change_checkbtn = ttk.Checkbutton(self,
            text="Change themes when combobox item is activated",
            variable=self.theme_autochange)

        themes_lbl.grid(ipadx=6, sticky="w")
        self.themes_combo.grid(row=0, column=1, padx=6, sticky="ew")
        change_btn.grid(row=0, column=2, padx=6, sticky="e")
        theme_change_checkbtn.grid(row=1, columnspan=3, sticky="w", pady=6)

        top = self.winfo_toplevel()
        top.rowconfigure(0, weight=1)
        top.columnconfigure(0, weight=1)
        self.columnconfigure(1, weight=1)
        self.grid(row=0, column=0, sticky="nsew", columnspan=3, rowspan=2)


def main():
    app = App()
    app.master.title("Theme Selector")
    app.mainloop()

if __name__ == "__main__":
    main()

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