subhabangal...@gmail.com wrote: > Dear Group, > > I was trying to convert the list to a set, with the following code: > > set1=set(list1) > > the code was running fine, but all on a sudden started to give the > following error, > > set1=set(list1) > TypeError: unhashable type: 'list' > > please let me know how may I resolve. > > And sometimes some good running program gives error all on a sudden with > no parameter changed, how may I debug it?
Add a print statement before the offending line:
print list1
set1 = set(list1)
You will see that list1 contains another list, e. g. this works...
>>> list1 = ["alpha", "beta"]
>>>
>>>
>>> set(list1)
>>>
>>>
set(['alpha', 'beta'])
...while this doesn't:
>>> list1 = ["alpha", ["beta"]]
>>>
>>>
>>> set(list1)
>>>
>>>
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'list'
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