NEWBIE: Extending a For Statement.

[Jean-Paul Calderone]

On 21 May 2007 05:10:46 -0700, mosscliffe <mcl.office at googlemail.com> wrote:
>I keep seeing examples of statements where it seems conditionals are
>appended to a for statement, but I do not understand them.
>
>I would like to use one in the following scenario.
>
>I have a dictionary of
>
>mydict = { 1: 500, 2:700, 3: 800, 60: 456, 62: 543, 58: 6789}
>
>for key in mydict:
>     if key in xrange (60,69) or key == 3:
>           print key,mydict[key]
>
>I would like to have the 'if' statement as part of the 'for'
>statement.
>
>I realise it is purely cosmetic, but it would help me understand
>python syntax a little better.

Only list comprehensions and generator expressions support this extension
to the loop syntax.

[key, mydict[key] for key in mydict if key in xrange(60, 69) or key == 3]
(key, mydict[key] for key in mydict if key in xrange(60, 69) or key == 3]

For the statement form of 'for', there is no syntactic way to combine it
with 'if' into a single statement.

Jean-Paul