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/classes/Dbm.py
# A wrapper around the (optional) built-in class dbm, supporting keys
# and values of almost any type instead of just string.
# (Actually, this works only for keys and values that can be read back
# correctly after being converted to a string.)


class Dbm:

    def __init__(self, filename, mode, perm):
        import dbm
        self.db = dbm.open(filename, mode, perm)

    def __repr__(self):
        s = ''
        for key in self.keys():
            t = repr(key) + ': ' + repr(self[key])
            if s: t = ', ' + t
            s = s + t
        return '{' + s + '}'

    def __len__(self):
        return len(self.db)

    def __getitem__(self, key):
        return eval(self.db[repr(key)])

    def __setitem__(self, key, value):
        self.db[repr(key)] = repr(value)

    def __delitem__(self, key):
        del self.db[repr(key)]

    def keys(self):
        res = []
        for key in self.db.keys():
            res.append(eval(key))
        return res

    def has_key(self, key):
        return self.db.has_key(repr(key))


def test():
    d = Dbm('@dbm', 'rw', 0600)
    print d
    while 1:
        try:
            key = input('key: ')
            if d.has_key(key):
                value = d[key]
                print 'currently:', value
            value = input('value: ')
            if value is None:
                del d[key]
            else:
                d[key] = value
        except KeyboardInterrupt:
            print ''
            print d
        except EOFError:
            print '[eof]'
            break
    print d


test()

haha - 2025