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I am saving my data into a dictionary and after saving it to the dictionary I printed the data to see what it looks like and I see the unicode:

(u'520775', [[u'Kategori:2. divisjon fotball for herrer 2008']]) (u'754686', [[u'Kategori:Debutalbum', u'Kategori:Musikkalbum fra 1990', u'Kategori:Tre Sm\xe5 Kinesere-album']]) (u'381191', [[u'Kategori:Serierundene i Adeccoligaen 2007']]) (u'972597', [[u'Kategori:Tippeligaen 2011']]) (u'263001', [[u'Kategori:Musikkalbum fra 2003']]) (u'23037', [[u'Kategori:Luftforsvaret']]) (u'640060', [[u'Kategori:Deltagermedaljen', u'Kategori:F\xf8dsler i 1923', u'Kategori:Norske folkemusikere', u'Kategori:Norske trekkspillere', u'Kategori:Paul Harris Fellow', u'Kategori:Personer fra Vefsn kommune']])

I have the following code, I used the format option but it didn't really work. What also confuses me is,when I print the id prior to saving it in dictionary, I see it without integer.

Here is the segment of the code, 

for (pageId, pageData) in data['query']['pages'].iteritems(): categoryTitles = []; idTitleDictionary[pageId] = []; print pageId; try: for category in pageData['categories']: categoryTitles.append(category['title']); idTitleDictionary[format(pageId)].append(categoryTitles);

I am trying it figure how to encode it prior to saving it into a dictionary.

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When you print a dict, or list, or tuple, repr is called on the items in the container, rather than str like when you print them directly, so you see the unicode escape codes.

If you were to 

mydict = dict(((u'520775', [[u'Kategori:2. divisjon fotball for herrer 2008']]), (u'754686', [[u'Kategori:Debutalbum', u'Kategori:Musikkalbum fra 1990', u'Kategori:Tre Sm\xe5 Kinesere-album']]), (u'381191', [[u'Kategori:Serierundene i Adeccoligaen 2007']]), (u'972597', [[u'Kategori:Tippeligaen 2011']]), (u'263001', [[u'Kategori:Musikkalbum fra 2003']]), (u'23037', [[u'Kategori:Luftforsvaret']]), (u'640060', [[u'Kategori:Deltagermedaljen', u'Kategori:F\xf8dsler i 1923', u'Kategori:Norske folkemusikere', u'Kategori:Norske trekkspillere', u'Kategori:Paul Harris Fellow', u'Kategori:Personer fra Vefsn kommune']]))) for key, value in mydict.iteritems(): print key, for elem in value[0]: print elem + ',', print

You'd see the strings encoded properly for your terminal. You don't need to do anything to those strings to interpret the escape codes -- everything is stored properly, it's just how it's being displayed.

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So this means I can go on with my business because I plan to use the data in the dictionary to make some sql queries. These data were collected from an api. Thats why I was concerned.
Thanks mate I tried a simple example on the terminal great, and thanks for the excellent fast answer, here is my example: >>> mydict = {} >>> pageId = 12345 >>> mydict[pageId] = [] >>> mydict {12345: []} >>> mydict[pageId].append(['Category1', 'Category2'] ... )

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