How to output set items without the curly braces ?

[jimthecanadian]

Hi all,

I have not coded for a while and am still getting used to all the new fangled data types :)

I am taking a course in Database mining and we have been set a first problem of mining frequent patterns using the apriori algorithm. Now I have a pretty solid understanding of the logic but I when I am trying to print because of the way I have my data represented I can't figure out how to do it the way I would like. I am able to get through the first pass where I end up with a list of 1 item sets and a related value in another list. so the data looks like this candidates({book},{pencil}, {School bag},...) and I am able to iterate through it quite simply by doing this:

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for x in candidates:     for y in x:         print(y ))

I do this because I do not wan the curly braces printed do I dereference he set element. Now on the second pass I have a list of sets containing two elements candidates({book, pencil},{book, school bag}, {pencil, School bag},...) and I would like to print it the same way with both set elements on one line. I have tried this but, no luck

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for x in candidates:     for y,z in x:         print(y + " , " + z))

Thanks for any pointers

[Yoriz]

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candidates = ({'book'}, {'pencil'}, {'School bag'})   for x in candidates:     print(', '.join(y for y in x))

Output:
book
pencil
School bag

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candidates2 = ({'book', 'pencil'}, {'book', 'school bag'},                {'pencil', 'School bag'})   for x in candidates2:     print(', '.join(y for y in x))

Output:
pencil, book
book, school bag
pencil, School bag

[jimthecanadian]

Thanks, Yoriz. exactly what I needed

[perfringo]

There is also possibility to use unpacking, which can be used with any iterable (note that sets are unordered):

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>>> first = ({'book'}, {'pencil'}, {'School bag'}) >>> for element in first: ...     print(*element) ... book pencil School bag >>> second = ({'book', 'pencil'}, {'book', 'school bag'}, {'pencil', 'School bag'}) >>> for element in second: ...     print(*element, sep=', ') ... pencil, book book, school bag School bag, pencil