Faster (smarter?) dictionary building

[Michael T. Babcock]

I have a list of column headings and an array of values:
headings, values = ['a', 'b', 'c'], [1, 2, 3]

I want to construct a dictionary such that d['a'] = 1 and so on.

The first way I tried to do this was:

d = {}
for h,v in headings, values:
d[h] = v

It turns out this doesn't work, but it was worth a try. I ended up
falling back on the more C-like:

for i in range(len(headings)):
d[h[i]] = v[i]

Is there anything somewhat cleaner or more pythonesque I could do
instead? Thanks.

--
Michael T. Babcock
C.T.O., FibreSpeed Ltd.
http://www.fibrespeed.net/~mbabcock

[David Eppstein]

In article <ma************************************@python.org >,
"Michael T. Babcock" <mb******@fibrespeed.net> wrote:

I have a list of column headings and an array of values:
headings, values = ['a', 'b', 'c'], [1, 2, 3]

I want to construct a dictionary such that d['a'] = 1 and so on.

d = dict(zip(headings,values))

--
David Eppstein http://www.ics.uci.edu/~eppstein/
Univ. of California, Irvine, School of Information & Computer Science

[Bengt Richter]

On Thu, 30 Oct 2003 14:45:48 -0500, "Michael T. Babcock" <mb******@fibrespeed.net> wrote:

I have a list of column headings and an array of values:
headings, values = ['a', 'b', 'c'], [1, 2, 3]

I want to construct a dictionary such that d['a'] = 1 and so on.

The first way I tried to do this was:

d = {}
for h,v in headings, values:
d[h] = v

It turns out this doesn't work, but it was worth a try. I ended up

IMO it would be interesting to make that work, but spelling it like a tuple unpacking
assignment with a 'for' in front of it, to make it step through the sequences on the right. E.g,

d = {}
for h,v = headings, values: # illegal now, proposed lazy parallel sequence unpacking
d[h] = v

would work as "expected", i.e., as if

for h,v in itertools.izip(headings,values):
d[h] = v

Regards,
Bengt Richter