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[David Abrahams]
> . . . I want to put in another plug for itemize(),
Well, since we're doing post-Pronouncement fantasizing . . .
here's one more plug for "itemize".
Noting that
for k,v in adict.iteritems():
is probably as useful as
for i,v in enumerate(aseq):
why not change the spec to:
>>> def itemize(iterable):
... # use iteritems if defined
... try:
... for item in iterable.iteritems(): yield item
... except AttributeError: pass
... # and then everything as before
... i =3D 0
... iterator =3D iter(iterable)
... while 1:
... yield i,iterator.next()
... i +=3D 1
...
So "itemize(iterable)" returns an iterator that yields (k,v) pairs from =
the iterable.iteritems() method if defined, else pairs generated by =
associating 0,1,...,n-1 with n values from iter(iterable).
This allows
for k,v in itemize(adict_or_aseq):
to be written uniformly for dicts and seqs.
And makes=20
list(itemize(adict)) =3D=3D adict.items()
work, removing one of the objections to the name "itemize".
Also, if one were to need, for example, a sequence whose indices start =
at 1 instead of 0, one could define a sequence class that implements =
iteritems and objects of said class would work just fine with "itemize".
Jim
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<DIV><FONT face=3DArial size=3D2>[David Abrahams]</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>> . . . I want to put in =
another plug for=20
itemize(),<BR></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Well, since we're doing =
post-Pronouncement=20
fantasizing . . .</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial><FONT size=3D2>here's one more plug for=20
"itemize".</FONT></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Noting that</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3D"Courier New" size=3D2> for k,v in=20
adict.iteritems():</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>is probably as useful as</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3D"Courier New" size=3D2> for i,v in=20
enumerate(aseq):</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>why not c</FONT><FONT =
face=3DArial><FONT size=3D2>hange=20
the spec to:</FONT></FONT></DIV>
<DIV><FONT face=3DArial><FONT size=3D2></FONT></FONT> </DIV>
<DIV><FONT face=3D"Courier New" size=3D2>>>> def=20
itemize(iterable):<BR>... # use iteritems if=20
defined<BR>... =20
try:<BR>... for item in=20
iterable.iteritems(): yield item<BR>... except=20
AttributeError: pass<BR>... # and then =
everything as=20
before<BR>... i =3D =
0<BR>... =20
iterator =3D iter(iterable)<BR>... while=20
1:<BR>... yield=20
i,iterator.next()<BR>... =
i +=3D=20
1<BR>...<BR></FONT></DIV>
<DIV><FONT face=3DArial><FONT><FONT size=3D2><FONT>So =
"itemize(iterable)" returns an=20
iterator that yields (k,v) pairs from the iterable.iteritems() method if =
defined, else pairs generated by associating 0,1,...,n-1 with n values =
from=20
iter(iterable).</FONT></FONT></FONT></FONT></DIV>
<DIV><FONT face=3DArial><FONT><FONT=20
size=3D2><FONT></FONT></FONT></FONT></FONT> </DIV>
<DIV><FONT face=3DArial><FONT><FONT size=3D2><FONT>This=20
allows</FONT></FONT></FONT></FONT></DIV>
<DIV><FONT face=3DArial><FONT><FONT=20
size=3D2><FONT></FONT></FONT></FONT></FONT> </DIV>
<DIV><FONT><FONT size=3D2><FONT face=3D"Courier New"> =
for k,v in=20
itemize(adict_or_aseq):</FONT></FONT></FONT></DIV>
<DIV><FONT face=3DArial><FONT><FONT=20
size=3D2><FONT></FONT></FONT></FONT></FONT> </DIV>
<DIV><FONT face=3DArial><FONT><FONT size=3D2><FONT>to be written =
uniformly for dicts=20
and seqs.</FONT></FONT></FONT></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>And makes </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3D"Courier New" size=3D2> =
list(itemize(adict)) =3D=3D=20
adict.items()</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>work, removing one of the objections to =
the name=20
"itemize".</FONT></DIV>
<DIV><FONT face=3DArial><FONT><FONT=20
size=3D2><FONT></FONT></FONT></FONT></FONT> </DIV>
<DIV><FONT face=3DArial><FONT><FONT size=3D2><FONT>Also, if one were to =
need, for=20
example, a sequence whose indices start at 1 instead of 0, one =
could define=20
a sequence class that implements iteritems and objects of said =
class would=20
work just fine with =
"itemize".</FONT></FONT></FONT></FONT></DIV>
<DIV><FONT face=3DArial><FONT><FONT=20
size=3D2><FONT></FONT></FONT></FONT></FONT> </DIV>
<DIV><FONT face=3DArial><FONT><FONT=20
size=3D2><FONT>Jim</DIV></FONT></FONT></FONT></FONT></BODY></HTML>
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