Dump a database file to a pickle，dumppickle,'''PYTHON SO

Dump a database file to a pickle，dumppickle,'''PYTHON SO

'''PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2--------------------------------------------1. This LICENSE AGREEMENT is between the Python Software Foundation('PSF'), and the Individual or Organization ('Licensee') accessing andotherwise using this software ('Python') in source or binary form andits associated documentation.2. Subject to the terms and conditions of this License Agreement, PSFhereby grants Licensee a nonexclusive, royalty-free, world-widelicense to reproduce, analyze, test, perform and/or display publicly,prepare derivative works, distribute, and otherwise use Pythonalone or in any derivative version, provided, however, that PSF'sLicense Agreement and PSF's notice of copyright, i.e., 'Copyright (c)2001, 2002, 2003, 2004 Python Software Foundation; All Rights Reserved'are retained in Python alone or in any derivative version preparedby Licensee.3. In the event Licensee prepares a derivative work that is based onor incorporates Python or any part thereof, and wants to makethe derivative work available to others as provided herein, thenLicensee hereby agrees to include in any such work a brief summary ofthe changes made to Python.4. PSF is making Python available to Licensee on an 'AS IS'basis.  PSF MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS ORIMPLIED.  BY WAY OF EXAMPLE, BUT NOT LIMITATION, PSF MAKES NO ANDDISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESSFOR ANY PARTICULAR PURPOSE OR THAT THE USE OF PYTHON WILL NOTINFRINGE ANY THIRD PARTY RIGHTS.5. PSF SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHONFOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS ASA RESULT OF MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON,OR ANY DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF.6. This License Agreement will automatically terminate upon a materialbreach of its terms and conditions.7. Nothing in this License Agreement shall be deemed to create anyrelationship of agency, partnership, or joint venture between PSF andLicensee.  This License Agreement does not grant permission to use PSFtrademarks or trade name in a trademark sense to endorse or promoteproducts or services of Licensee, or any third party.8. By copying, installing or otherwise using Python, Licenseeagrees to be bound by the terms and conditions of this LicenseAgreement.'''#!/usr/bin/env python'''Synopsis: %(prog)s [-h|-g|-b|-r|-a] dbfile [ picklefile ]Convert the database file given on the command line to a picklerepresentation.  The optional flags indicate the type of the database:    -a - open using anydbm    -b - open as bsddb btree file    -d - open as dbm file    -g - open as gdbm file    -h - open as bsddb hash file    -r - open as bsddb recno fileThe default is hash.  If a pickle file is named it is opened for writeaccess (deleting any existing data).  If no pickle file is named, the pickleoutput is written to standard output.'''import getopttry:    import bsddbexcept ImportError:    bsddb = Nonetry:    import dbmexcept ImportError:    dbm = Nonetry:    import gdbmexcept ImportError:    gdbm = Nonetry:    import anydbmexcept ImportError:    anydbm = Noneimport systry:    import cPickle as pickleexcept ImportError:    import pickleprog = sys.argv[0]def usage():    sys.stderr.write(__doc__ % globals())def main(args):    try:        opts, args = getopt.getopt(args, 'hbrdag',                                   ['hash', 'btree', 'recno', 'dbm',                                    'gdbm', 'anydbm'])    except getopt.error:        usage()        return 1    if len(args) == 0 or len(args) > 2:        usage()        return 1    elif len(args) == 1:        dbfile = args[0]        pfile = sys.stdout    else:        dbfile = args[0]        try:            pfile = open(args[1], 'wb')        except IOError:            sys.stderr.write('Unable to open %s\n' % args[1])            return 1    dbopen = None    for opt, arg in opts:        if opt in ('-h', '--hash'):            try:                dbopen = bsddb.hashopen            except AttributeError:                sys.stderr.write('bsddb module unavailable.\n')                return 1        elif opt in ('-b', '--btree'):            try:                dbopen = bsddb.btopen            except AttributeError:                sys.stderr.write('bsddb module unavailable.\n')                return 1        elif opt in ('-r', '--recno'):            try:                dbopen = bsddb.rnopen            except AttributeError:                sys.stderr.write('bsddb module unavailable.\n')                return 1        elif opt in ('-a', '--anydbm'):            try:                dbopen = anydbm.open            except AttributeError:                sys.stderr.write('anydbm module unavailable.\n')                return 1        elif opt in ('-g', '--gdbm'):            try:                dbopen = gdbm.open            except AttributeError:                sys.stderr.write('gdbm module unavailable.\n')                return 1        elif opt in ('-d', '--dbm'):            try:                dbopen = dbm.open            except AttributeError:                sys.stderr.write('dbm module unavailable.\n')                return 1    if dbopen is None:        if bsddb is None:            sys.stderr.write('bsddb module unavailable - ')            sys.stderr.write('must specify dbtype.\n')            return 1        else:            dbopen = bsddb.hashopen    try:        db = dbopen(dbfile, 'r')    except bsddb.error:        sys.stderr.write('Unable to open %s.  ' % dbfile)        sys.stderr.write('Check for format or version mismatch.\n')        return 1    for k in db.keys():        pickle.dump((k, db[k]), pfile, 1==1)    db.close()    pfile.close()    return 0if __name__ == '__main__':    sys.exit(main(sys.argv[1:]))