What does zip mean?

milos zorica miloshzorica at gmail.com
Sun Nov 9 12:06:25 CET 2014


sorry my bad

On Sun, Nov 9, 2014 at 7:58 AM, Steven D'Aprano <
steve+comp.lang.python at pearwood.info> wrote:

> satishmlmlml at gmail.com wrote:
>
> > What does zip return in the following piece of code?
>
> Have you read the Fine Manual?
>
> In Python 2, zip returns a list:
>
> zip(['a', 'b', 'c'], [1, 2, 3])
>
> => [('a', 1), ('b', 2), ('c', 3)]
>
> https://docs.python.org/2/library/functions.html#zip
>
>
> In Python 3, zip does the same, except instead of a list, it returns a
> special iterator which produces the items on demand rather than in advance.
>
> https://docs.python.org/3/library/functions.html#zip
>
>
>
> > curs.execute('select * from people')
> > colnames = [desc[0] for desc in curs.description]
> > rowdicts = []
> > for row in curs.fetchall():
> >            rowdicts.append(dict(zip(colnames, row)))
>
> zip(colnames, row) will return:
>
> (first column name, first item of row),
> (second column name, second item of row),
> (third column name, third item of row),
> etc.
>
>
>
> --
> Steven
>
> --
> https://mail.python.org/mailman/listinfo/python-list
>



-- 
Milos Zorica
+1 845 277 0549 | +1 786 471 4846
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