urllib.open problem

Astan Chee stanc at al.com.au
Sat Sep 17 23:14:53 CEST 2005


OKay, but how do I check (and possibly change) _proxy environment 
variables in python? I know in perl its somewhere along the lines of  
$ENV{'env_name'}, is it the same in python?
Thanks again
Cheers

Fredrik Lundh wrote:

>Astan Chee wrote:
>
>  
>
>>    I have a python script which runs perfectly on my machine.
>>    However a machine that I tested it on gives the following error
>>message:
>>
>>    Traceback (most recent call last):
>>      File "whip.py", line 616, in OnRebootRunning
>>      File "whip.py", line 626, in RebootCustom
>>      File "urllib.pyc", line 77, in urlopen
>>      File "urllib.pyc", line 170, in open
>>    TypeError: cannot concatenate 'str' and 'NoneType' objects
>>
>>    The code snipplet where this error
>>    happens is
>>    f = urllib.urlopen("http://www.hotmail.com/)
>>    notes= f.readlines()
>>
>>Does anyone know what causes this error? Im perplexed because it works
>>on some machines and it doesnt work on other computers although they all
>>have the same spec.
>>    
>>
>
>assuming you're using Python 2.4, the relevant portion of urllib.py
>looks like this:
>
>        urltype, url = splittype(fullurl)
>        if not urltype:
>            urltype = 'file'
>        if urltype in self.proxies:
>            proxy = self.proxies[urltype]
>            urltype, proxyhost = splittype(proxy)
>            host, selector = splithost(proxyhost)
>            url = (host, fullurl) # Signal special case to open_*()
>        else:
>            proxy = None
>        name = 'open_' + urltype # <-- this is line 170
>
>the error message indicates that urltype is None when you get to
>line 170, and the only way it can get set to None is a bogus proxy
>setting (causing splittype to fail).
>
>checking the environment for things that end with "_proxy" should
>help.
>
></F>
>
>
>
>  
>
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