[Tutor] Dictionaries

[Kent Johnson]

Jon Moore wrote:
> Kent
> 
> Thanks! I have not come accross string formatting yet, but I can see how 
> the for statement works.
> 
> How would I modify this to just print either the values or keys?

Use
   for key in pairs.iterkeys():
or
   for value in pairs.itervalues():
and change the print statement appropriately.

This page shows the operations available on a dict:
http://docs.python.org/lib/typesmapping.html

Kent

> 
> Jon
> 
> On 26/01/06, *Kent Johnson* <kent37 at tds.net <mailto:kent37 at tds.net>> wrote:
> 
>     Jon Moore wrote:
>      > Hi
>      >
>      > Is there anyway to print informtation from dictionaries better
>     than this?:
>      >
>      >  >>> pairs = {"Jon Moore": "Tony Moore",
>      >          "Simon Nightingale": "John Nightingale",
>      >          "David Willett": "Bernard Willet",
>      >          "John Jackson": "Stuart Jackson",
>      >          "James Southey": "Richard Southey",
>      >          "William Forsythe": "Shaun Forsythe"}
>      >  >>> print pairs.keys()
>      > ['David Willett', 'Jon Moore', 'John Jackson', 'Simon Nightingale',
>      > 'James Southey', 'William Forsythe']
>      >  >>>
>      >
>      > Is there no way to make it a nice list as I want to print the
>     keys and
>      > values next to each other in a list such as:
> 
>     Of course there is :-)
>       >>> for father, son in pairs.iteritems():
>       ...   print '%-20s %s' % (father, son)
>       ...
>     David Willett        Bernard Willet
>     Jon Moore            Tony Moore
>     John Jackson         Stuart Jackson
>     Simon Nightingale    John Nightingale
>     James Southey        Richard Southey
>     William Forsythe     Shaun Forsythe
> 
>     pairs.iteritems() iterates over key, value pairs. The string formatting
>     operations are very handy for formatted output.
>     http://docs.python.org/lib/typesseq-strings.html
> 
>     Kent
> 
>      >
>      > Jon Moore                  Tony Moore
>      > Simon Nightingale       John Nightingale
>      > David Willett               Bernard Willet
>      > John Jackson             Stuart Jackson
>      > James Southey          Richard Southey
>      > William Forsythe        Shaun Forsythe
>      >
>      > For anyone who is wondering, it is to show father/son pairs. Next
>     is to
>      > add grandfathers *eek*.
>      > --
>      > Best Regards
>      >
>      > Jon Moore
>      >
>      >
>      >
>     ------------------------------------------------------------------------
> 
>      >
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> 
> 
> 
> -- 
> Best Regards
> 
> Jon Moore