"Norman Khine" <[EMAIL PROTECTED]> wrote
but when I run this, I get the following error on the line:
if x and y and (x, y) in table:
TypeError: list objects are unhashable
Please post the entire error. The tiny bit you posted was
not overly helpful, usually the stacjk trace contains the
actual cause of the problem or a strong clue. However,
in this case...
x = ['airlines-scheduled', 'airport-car-parking']
You cannot use a list to access a dictionary because
dictionary keys must be immutable, and lists aren't.
When you use the 'in' operation on a dictionary it
basically searches the keys.
I am basically looping through files within each file, I have an
entity, for example:
file1
<topic>airlines-scheduled airport-car-parking</topic>
file2
<topic>airport-car-parking</topic>
etc...
So the above code counts all occurrences of 'airport-car-parking'
and sums it up.
All works well if, I change the code to:
for brain in brains:
x = getattr(brain, horizontal)
x = string.join(x, '' )
y = getattr(brain, vertical)
y = string.join(y, '' )
if x and y and (x, y) in table:
table[(x, y)] += 1
table[(x, '')] += 1
table[('', y)] += 1
table[('', '')] += 1
So now my list becomes a string, which is not really good for me, as
this fails when there is more then one item.
Use a tuple instead of a list.
t = tuple(L)
You can use a tuple as an index to a dictionary.
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.freenetpages.co.uk/hp/alan.gauld
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