Sorting a set works, sorting a dictionary fails ?

[Νικόλαος Κούρας]

Trying this:

months = { 'Ιανουάριος':1, 'Φεβρουάριος':2, 'Μάρτιος':3, 'Απρίλιος':4, 'Μάϊος':5, 'Ιούνιος':6, \
	   'Ιούλιος':7, 'Αύγουστος':8, 'Σεπτέμβριος':9, 'Οκτώβριος':10, 'Νοέμβριος':11, 'Δεκέμβριος':12 }

for key in sorted( months.values() ):
	print('''
		<option value="%s"> %s </option>
	''' % (months[key], key) )


output this:

[Mon Jun 10 11:25:11 2013] [error] [client 79.103.41.173]   File "/home/nikos/public_html/cgi-bin/pelatologio.py", line 310, in <module>, referer: http://superhost.gr/
[Mon Jun 10 11:25:11 2013] [error] [client 79.103.41.173]     ''' % (months[key], key) ), referer: http://superhost.gr/
[Mon Jun 10 11:25:11 2013] [error] [client 79.103.41.173] KeyError: 1, referer: http://superhost.gr/

KeyError 1 ??!! All i did was to tell python to sort the dictionary values, which are just integers.