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/anydbm.py
"""Generic interface to all dbm clones.

Instead of

        import dbm
        d = dbm.open(file, 'w', 0666)

use

        import anydbm
        d = anydbm.open(file, 'w')

The returned object is a dbhash, gdbm, dbm or dumbdbm object,
dependent on the type of database being opened (determined by whichdb
module) in the case of an existing dbm. If the dbm does not exist and
the create or new flag ('c' or 'n') was specified, the dbm type will
be determined by the availability of the modules (tested in the above
order).

It has the following interface (key and data are strings):

        d[key] = data   # store data at key (may override data at
                        # existing key)
        data = d[key]   # retrieve data at key (raise KeyError if no
                        # such key)
        del d[key]      # delete data stored at key (raises KeyError
                        # if no such key)
        flag = key in d   # true if the key exists
        list = d.keys() # return a list of all existing keys (slow!)

Future versions may change the order in which implementations are
tested for existence, and add interfaces to other dbm-like
implementations.
"""

class error(Exception):
    pass

_names = ['dbhash', 'gdbm', 'dbm', 'dumbdbm']
_errors = [error]
_defaultmod = None

for _name in _names:
    try:
        _mod = __import__(_name)
    except ImportError:
        continue
    if not _defaultmod:
        _defaultmod = _mod
    _errors.append(_mod.error)

if not _defaultmod:
    raise ImportError, "no dbm clone found; tried %s" % _names

error = tuple(_errors)

def open(file, flag='r', mode=0666):
    """Open or create database at path given by *file*.

    Optional argument *flag* can be 'r' (default) for read-only access, 'w'
    for read-write access of an existing database, 'c' for read-write access
    to a new or existing database, and 'n' for read-write access to a new
    database.

    Note: 'r' and 'w' fail if the database doesn't exist; 'c' creates it
    only if it doesn't exist; and 'n' always creates a new database.
    """

    # guess the type of an existing database
    from whichdb import whichdb
    result=whichdb(file)
    if result is None:
        # db doesn't exist
        if 'c' in flag or 'n' in flag:
            # file doesn't exist and the new
            # flag was used so use default type
            mod = _defaultmod
        else:
            raise error, "need 'c' or 'n' flag to open new db"
    elif result == "":
        # db type cannot be determined
        raise error, "db type could not be determined"
    else:
        mod = __import__(result)
    return mod.open(file, flag, mode)

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