getfirst and re

Victor Subervi victorsubervi at gmail.com
Fri Jan 8 21:01:55 CET 2010


On Fri, Jan 8, 2010 at 3:37 PM, MRAB <python at mrabarnett.plus.com> wrote:

> Victor Subervi wrote:
>
>> On Fri, Jan 8, 2010 at 3:09 PM, Victor Subervi <victorsubervi at gmail.com<mailto:
>> victorsubervi at gmail.com>> wrote:
>>
>>
>>
>>    On Fri, Jan 8, 2010 at 2:52 PM, Jean-Michel Pichavant
>>    <jeanmichel at sequans.com <mailto:jeanmichel at sequans.com>> wrote:
>>
>>        Victor Subervi wrote:
>>
>>            On Fri, Jan 8, 2010 at 1:26 PM, Steve Holden
>>            <steve at holdenweb.com <mailto:steve at holdenweb.com>
>>            <mailto:steve at holdenweb.com <mailto:steve at holdenweb.com>>>
>>
>>            wrote:
>>
>>               MRAB wrote:
>>               > Victor Subervi wrote:
>>               > [snip]
>>               >>
>>               >> Code snippet:
>>               >>
>>               >> def cgiFieldStorageToDict(fieldStorage):
>>                                           ^^^^^^^^^^^^
>>               Further hint ...
>>
>>               >>   params = {}
>>               >>   for key in fieldStorage.keys():
>>               >>     params[key] = cgi.FieldStorage[key].value
>>               >                     ^^^^^^^^^^^^^^^^^^^^^
>>               > This is your problem.
>>
>>
>>            The problem is that I don't understand this code that I
>>            exactly copied from a Web page tutorial. Can you folks point
>>            me to tutorials where I can learn to comprehend this code?
>>            Specifically, the line in question. How is it that one can
>>            code "params[key]" (what does that mean?) and the other
>>            side, what does that mean
>>
>>        I think you are gathering more fans Victor :)
>>
>>        http://docs.python.org/tutorial/datastructures.html#dictionaries
>>
>>
>>    This still isn't telling me what I need to know. Perhaps I'm missing
>>    the point, as in the recent case with putting the "print cookie"
>>    statement in the header. I am assuming (translation: making an a$$
>>    out of you and me) that "params[key] automatically assigns the
>>    fieldStorage key to the newly created params key in the dict of the
>>    same, and assigning the value from the cgi.FieldStorage of that key
>>    to the params value. Is that correct?
>>    TIA,
>>    beno
>>
>>
>> I may have answered my own question. I have this:
>>
>> def cgiFieldStorageToDict(fieldStorage):
>>  params = {}
>>  for key in fieldStorage.keys():
>>    params[key] = fieldStorage[key].value
>>  return params
>>
>>  Which is what Recipe 81547 actually says!
>
>
>   dict = cgiFieldStorageToDict(cgi.FieldStorage())
>>  print dict
>>
>> which gave me this:
>>
>> {'store': 'products', 'cat': 'prodCat1'}
>>
>> which looks about right. I would have written the code like this:
>>
>>  keys = []
>>  values = []
>>  for key, value in fieldStorage.iteritems():
>>    keys.append(key)
>>    values.append(value)
>>  params = dict(zip(keys, values))
>>
>> which obviously isn't as elegant. But that's what I knew. Learned another
>> trick, I guess ;)
>>
>>  If that works then so should this:
>
>    params = dict(fieldStorage.iteritems())


Yeah. Thanks!
beno
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