Hi!
My code is

 > db = {}
 >
> def display():
>     keyList = db.keys()
>     sortedList = keyList.sort()
>     for name in sortedList:
>         line = 'Name: %s, Number: %s' % (name, db[name])
>         print line.replace('\r', '')

And it gives following error:

>     for name in sortedList:
> TypeError: 'NoneType' object is not iterable

How can sortedList variable turn into NoneType? I just don't get it...
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