dbshelve.py 文件源码

def open(filename, flags=db.DB_CREATE, mode=0660, filetype=db.DB_HASH,
         dbenv=None, dbname=None):
    """
    A simple factory function for compatibility with the standard
    shleve.py module.  It can be used like this, where key is a string
    and data is a pickleable object:

        from bsddb import dbshelve
        db = dbshelve.open(filename)

        db[key] = data

        db.close()
    """
    if type(flags) == type(''):
        sflag = flags
        if sflag == 'r':
            flags = db.DB_RDONLY
        elif sflag == 'rw':
            flags = 0
        elif sflag == 'w':
            flags =  db.DB_CREATE
        elif sflag == 'c':
            flags =  db.DB_CREATE
        elif sflag == 'n':
            flags = db.DB_TRUNCATE | db.DB_CREATE
        else:
            raise db.DBError, "flags should be one of 'r', 'w', 'c' or 'n' or use the bsddb.db.DB_* flags"

    d = DBShelf(dbenv)
    d.open(filename, dbname, filetype, flags, mode)
    return d

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