[Tutor] reducing lists within list to their set of unique values

[Treder, Robert]

Hi python folks,
 
I have a list of lists that looks something like this: 
 
tst = [ [], ['test'], ['t1', 't2'], ['t1', 't1', 't2'] ]
 
I want to change the empty sets to a blank string, i.e., '' and the lists with repeat values to the unique set of values. So I have done the following: 
 
>>> for t in tst:
	if len(t) == 0:
		tst.__setitem__(tst.index(t), '')
	else:
		tst.__setitem__(tst.index(t), set(t))

What I get in return is 

>>> tst
['', set(['test']), set(['t2', 't1']), set(['t2', 't1'])]

The empty list is fine but the other lists seem to be expressions rather than values. What do I need to do to simply get the values back liike the following? 

['', ['test'], ['t2', 't1'], ['t2', 't1']]


Thanks, 
Bob
 



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