用python -i写交互式shell

cabinet是公司的一个数据存储服务，需要添加一个shell client，查看数据，做简单操作。

用python写了一个比想象的简单。代码如下:

#! /usr/bin/python -i
# coding: utf-8

import sys
import os

dirname = os.path.dirname(sys.argv[0])
sys.path.append(dirname + '/gen-py')
sys.path.append('/usr/lib/python2.7/site-packages')
from cabinet import CabinetStorage
from document.ttypes import Document
from thrift import Thrift
from thrift.transport import TSocket
from thrift.transport import TTransport
from thrift.protocol import TCompactProtocol
from optparse import OptionParser

# avoid UnicodeDecodeError
reload(sys)
sys.setdefaultencoding( "utf-8" )

try:
  # command line arguments.
  parser = OptionParser(usage="usage: %prog [options]", version="%prog 1.0")
  parser.add_option("-c", "--host", dest = "host", action = "store", default = "127.0.0.1", type = "string", help = "Specify cabinet host.")
  parser.add_option("-p", "--port", dest = "port", action = "store", default = 9090, type = "int", help = "Specify cabinet port.")
  (options, args) = parser.parse_args()

  # connect to cabinet server.
  transport = TSocket.TSocket(options.host, options.port)
  transport = TTransport.TBufferedTransport(transport)
  protocol = TCompactProtocol.TCompactProtocol(transport)
  client = CabinetStorage.Client(protocol)
  transport.open()
except Exception as e:
  print e
  os._exit(1)

# welcome info.
print "Cabinet Shell V1.0, Copyright i-MD 2013, All rights reserved."
print "For usage, invoke help().\n"

# main functions.
def help():
  print "Main functions:"
  print "  get(db, id)"
  print "  set(db, id, val)"
  print "  delete(db, id)"
  print "  unpackDocInfo(docstr)"
  print "  packDocInfo(doc)"

def get(db, id):
  return client.Get(db, id) 

def set(db, id, val):
  return client.Set(db, id, val)

def delete(db, id):
  return client.delete(db, id)

def packDocInfo(doc):
  transportOut = TTransport.TMemoryBuffer()
  protocolOut = TCompactProtocol.TCompactProtocol(transportOut)
  doc.write(protocolOut)
  return transportOut.getvalue()

def unpackDocInfo(docstr):
  transportIn = TTransport.TMemoryBuffer(docstr)
  protocolIn = TCompactProtocol.TCompactProtocol(transportIn)
  doc = Document()
  doc.read(protocolIn)
  return doc

不满意的地方是原生的python shell不保存history。