Hello folks,
I'm somewhat new to python and very new to Django. I'm trying to do
things "the right way" and I've encountered a problem.
At this point early in my project, all of my work has been to
customize the admin interface. For one of the databases, there is an
admin option to retrieve a new version of the data from an external
source.
In models.py, I added a custom exception to a new class ModelPlus, and
all models extend this class. It mostly works, but this line:
self.error = "Retrieve Error: %s" % e
does not work, in that self.error ends up as "Retrieve Error: ". If I
change "e" to "e.reason", it works fine. Could someone tell me why e
does not give me the string as intended?
I've included a bit of the code below as a reference.
Thanks very much,
Mike.
In "models.py":
class ModelPlus(models.Model):
"""Add helper methods to all models."""
class Meta:
abstract = True
def __unicode__(self):
if hasattr(self, 'name'):
return self.name
else:
return self.id
class RetrieveError(Exception):
def __init__(self, reason):
self.reason = reason
def __unicode__(self):
return self.reason
class TopList(ModelPlus):
"""Grab "Top 10" type lists."""
name = models.CharField(max_length=64)
error = models.CharField(max_length=128, blank=True)
[stuff deleted]
def retrieve(self):
"""Retrieve top entries from list."""
self.error = ""
try:
response = urllib2.urlopen(self.url, timeout =
30)
html = response.read()
response.close()
if not html:
raise self.RetrieveError("Document
Empty")
[stuff deleted]
# e is empty, but e.reason is correct
except self.RetrieveError as e:
self.error = "Retrieve Error: %s" % e
# this works as expected
except urllib2.URLError as e:
self.error = "URL Error: %s" % e
self.save()
return not bool(self.error)
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