Job Offer: Python Ninja or Pirate!

[George Sakkis]

On Dec 10, 11:07 pm, Stargaming <stargam... at gmail.com> wrote:
> On Mon, 10 Dec 2007 19:27:43 -0800, George Sakkis wrote:
> > On Dec 10, 2:11 pm, Stargaming <stargam... at gmail.com> wrote:
> >> On Mon, 10 Dec 2007 16:10:16 +0200, Nikos Vergas wrote:
>
> >> [snip]
>
> >> >> Problem: In the dynamic language of your choice, write a short
> >> >> program that will:
> >> >>  1. define a list of the following user ids 42346, 77290, 729 (you
> >> >>  can
> >> >> hardcode these, but it should
> >> >> still work with more or less ids)
> >> >>  2. retrieve an xml document related to each user at this url
> >> >>  "http://
> >> >> api.etsy.com/feeds/xml_user_details.php?id="
> >> >>  3. retrieve the data contained in the city element from each xml
> >> >> document
> >> >>  4. keep a running total of how many users are found in each city 5.
> >> >>  display the total count of users living in each city
> >> [snip]
>
> >> > i wanted to make it a one liner, but i had to import modules :(
>
> >> > import sys, xml, urllib
>
> >> > dummy = [sys.stdout.write(city + ': ' + str(num) + '\n') for city,
> >> > num in set([[(a, o.count(a)) for a in p] for o, p in [2*tuple([[city
> >> > for city in
> >> > ((xml.dom.minidom.parseString(urllib.urlopen('http://api.etsy.com/
> feeds/
>
> >> xml_user_details.php?id='
>
> >> > + str(id)).read()).getElementsByTagName('city')[0].childNodes +
> >> > [(lambda t: (setattr(t, 'data', 'no city'),
> >> > t))(xml.dom.minidom.Text())[1]])[0].data.lower().replace('  ', ' ')
> >> > for id in [71234, 71234, 71234, 71234, 71234, 71234,
> >> > 42792])]])]][0])]
>
> >> I suggest `__import__` in such cases.
>
> >> Even though I do not qualify for the job, I came up with this (<wink>)
> >> code (modified list values for demonstration, mixed together from
> >> previous post and original task):
>
> >> print '\n'.join('%s: %d'%(x,len(list(y))) for x,y in __import__
> >> ('itertools').groupby(sorted(__import__('xml').dom.minidom.parse
> >> (__import__('urllib').urlopen('http://api.etsy.com/feeds/
> >> xml_user_details.php?id=%d'%i)).getElementsByTagName('city')
> >> [0].lastChild.data.title() for i in (71234, 729, 42346, 77290, 729,
> >> 729))))
>
> >> I still find this rather readable, though, and there is no bad side-
> >> effect magic! :-)
>
> >> Output should be:
>
> >> | Chicago: 3
> >> | Fort Lauderdale: 1
> >> | Jersey City And South Florida: 1
> >> | New York: 1
>
> > Alas, it's not:
>
> > AttributeError: 'module' object has no attribute 'dom'
>
> > Here's a working version, optimized for char length (one line, 241
> > chars):
>
> > import urllib as U,elementtree.ElementTree as
> > E;c=[E.parse(U.urlopen('http://api.etsy.com/feeds/xml_user_details.php?
> > id=%d'%u)).findtext('//city')for u in
> > 71234,729,42346,77290,729,729];print'\n'.join('%s: %s'%
> > (i,c.count(i))for i in set(c))
>
> > George
>
> Heh, yes. I did the same error as the participant before me -- test it in
> a premodified environment. A fix is easy, __import__ 'xml.dom.minidom'
> instead of 'xml'. :-)

Closer, but still wrong; for some weird reason, __import__ for modules
in packages returns the top level package by default; you have to use
the 'fromlist' argument:

>>> __import__('xml.dom.minidom') is __import__('xml')
True

>>> __import__('xml.dom.minidom', fromlist=True)
<module 'xml.dom.minidom' from '/usr/local/lib/python2.5/xml/dom/
minidom.pyc'>


George