(Of course, it was done on prupose in order to verify if everybody is aware ;-)
I don't know why it is preferable to compare an object to the object "None" using "is not".
"==" is, IMHO, more simple. Simple is better than complex. So I use "==".
The correct program is:
import urllib2
for line in open("fileName.txt"):
addr, port = urllib2.splitport (line)
print (port == None) and '' or port
or
import urllib2
for line in open("fileName.txt"):
addr, port = urllib2.splitport(line)
if port == None:
print ''
else:
print port
On 3/4/06, Peter Hansen <[EMAIL PROTECTED]> wrote:
Cyril Bazin wrote:
> Your file looks like a list of IP adresses.
> You can use the urllib and urllib2 modules to parse IP adresses.
>
> import urllib2
> for line in open("fileName.txt"):
> addr, port = urllib2.splitport(line)
> print (port != None) and '' or port
Is this what you want to happen when port is None?
>>> port = None
>>> print (port != None) and '' or port
None
I think you're getting caught by the classic and/or trap in Python,
trying to avoid using a simple if statement.
By the way, equality comparison with None is generally a bad idea as
well, so even if the above worked it should be (port is not None) rather
than (port != None).
-Peter
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