Jon Bowlas wrote:
> I wrote this script in Zope some time ago and it worked for a while, but
> now I'm getting the following error:
> TypeError: coercing to Unicode: need string or buffer, NoneType found
>
> Here's my script:
>
> results = context.module_retriever().tuples() # call to ZSQLMethod
> converted = []
> for result in results:
> result = list(result) # make a list from the tuple
> for i in range(len(result)):
> # for each element in the listified tuple, make decode to a
> # unicode from the latin-1 string
> result[i] = unicode(result[i], 'latin-1')
> converted.append(tuple(result)) # tuplify again
> return converted
>
> Where module_retriever is a simple Z SQL method that returns a module
> title and a module code.
> So results = context.module_retriever().tuples() returns:
> [('Developmental Neurobiology', 'ANAT2008'), ('Neuroanatomy',
> 'ANAT2009'),('etc...', 'etc..'),..]So I was hoping someone might be able
> to identify what I've done wrong here. It is a little mistifying as to why
> it's suddenly stopped working though.CheersJon
This may be an indication that in your database you have a record with a
None value, e. g.
[('Developmental Neurobiology', 'ANAT2008'),
('Neuroanatomy', 'ANAT2009'),
('Man in black', None)])
and most likely the right fix is to correct the database entry and make sure
that no new such records can be entered into it.
If that is not possible, a quick fix would be to replace your unicode() call
with something that special-cases None:
def from_latin(s):
if s is None:
return None # or maybe 'return u""', if your app expects a unicode
# string
return unicode(s, "latin-1")
By the way, in recent Python your snippet might become
converted = []
for record in results:
# prior to 2.4: tuple([...])
converted.append(tuple(from_latin(field) for field in record))
return converted
Peter
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