问两台PC上的相同脚本，只有一台得到HTTP错误400

EN

#!/usr/bin/python
import sys
import ids
import csv
import bottlenose as BN
import lxml
import datetime
import os
from bs4 import BeautifulSoup
import numpy
import time
from urllib2 import HTTPError


def error_handler(err):
    ex = err['exception']
    if isinstance(ex, HTTPError) and ex.code == 503:
        time.sleep(random.expovariate(0.1))
        return True

amazon = BN.Amazon(AWSKEY,AWSSECRET,AWSID,Region='UK',                 MaxQPS=0.8, ErrorHandler=error_handler)

isbnclean = '0521663962'

response = amazon.ItemLookup(ItemId=isbnclean, ResponseGroup="Large")
print response
print 'Test Done'

 File "SimpleTest.py", line 24, in <module>
    response = amazon.ItemLookup(ItemId=isbnclean,     ResponseGroup="Large")
  File "/usr/local/lib/python2.7/dist-packages/bottlenose/api.py", line 265, in __call__
    {'api_url': api_url, 'cache_url': cache_url})
  File "/usr/local/lib/python2.7/dist-packages/bottlenose/api.py", line 226, in _call_api
    return urllib2.urlopen(api_request, timeout=self.Timeout)
  File "/usr/lib/python2.7/urllib2.py", line 154, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib/python2.7/urllib2.py", line 437, in open
    response = meth(req, response)
  File "/usr/lib/python2.7/urllib2.py", line 550, in http_response
     'http', request, response, code, msg, hdrs)
  File "/usr/lib/python2.7/urllib2.py", line 475, in error
    return self._call_chain(*args)
  File "/usr/lib/python2.7/urllib2.py", line 409, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 558, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
 urllib2.HTTPError: HTTP Error 400: Bad Request