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Today's Topics:
1. Re: for statement with addition ... (Rommel Asibal)
2. Re: for statement with addition ... (Kent Johnson)
3. Xampp & Python (Rommel Asibal)
4. Re: thesaurus (Dave Angel)
5. Re: for statement with addition ... (Dave Angel)
6. Re: for statement with addition ... (Markus Hubig)
----------------------------------------------------------------------
Message: 1
Date: Mon, 13 Jul 2009 05:22:28 -0600
From: Rommel Asibal <rumzs...@gmail.com>
To: Markus Hubig <mhu...@gmail.com>
Cc: tutor@python.org
Subject: Re: [Tutor] for statement with addition ...
Message-ID:
<de6a4e6f0907130422x2e1e5bf6n3fcfff4d4739e...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Markus,
That looks like a typo. remove it and it should work.
On Mon, Jul 13, 2009 at 4:50 AM, Markus Hubig <mhu...@gmail.com>
wrote:
Hi @all,
within diveintopython I often found a for-statement like this:
f for f in bla:
print f
So what actually is the first f for ... is it just to declare f
before
starting the for loop? I can't find any information on python.org
and it's hard to google this kinda stuff.
- Markus
--
-------------------"it's like this"------
even samurai have teddy bears
and even teddy bears get drunk
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Message: 2
Date: Mon, 13 Jul 2009 07:37:45 -0400
From: Kent Johnson <ken...@tds.net>
To: Markus Hubig <mhu...@gmail.com>
Cc: tutor@python.org
Subject: Re: [Tutor] for statement with addition ...
Message-ID:
<1c2a2c590907130437y4f19d357r811d0c956b53e...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
On Mon, Jul 13, 2009 at 6:50 AM, Markus Hubig<mhu...@gmail.com> wrote:
Hi @all,
within diveintopython I often found a for-statement like this:
f for f in bla:
??? print f
So what actually is the first f for ... is it just to declare f
before
starting the for loop? I can't find any information on python.org
and it's hard to google this kinda stuff.
That is not Python, maybe a copy/paste artifact? Omit the initial 'f
'. Can you point to an example on the web site or in the printed book?
Kent
------------------------------
Message: 3
Date: Mon, 13 Jul 2009 05:56:46 -0600
From: Rommel Asibal <rumzs...@gmail.com>
To: Python Tutor List <tutor@python.org>
Subject: [Tutor] Xampp & Python
Message-ID:
<de6a4e6f0907130456t491ea967i40ab083aebdda...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hello All,
I am trying to go through the "Python Power!" book and i am at the
part
where i need to setup a web server. I am thinking of using XAMPP
and have
checked its site and wanted to try using mod_python. I am using
Python 3.1
but from initial looks it seems mod_python doesnt support it, could
someone
verify if that is correct? Does that mean i have to go to python
2.6 for it
to work?
Thanks!
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------------------------------
Message: 4
Date: Mon, 13 Jul 2009 07:57:54 -0400
From: Dave Angel <da...@ieee.org>
To: Pete Froslie <fros...@gmail.com>
Cc: Alan Gauld <alan.ga...@btinternet.com>, tutor@python.org, Dave
Angel <da...@ieee.org>
Subject: Re: [Tutor] thesaurus
Message-ID: <4a5b2142.7080...@ieee.org>
Content-Type: text/plain; charset=UTF-8; format=flowed
Pete Froslie wrote:
The url function btw:
def url():
fin = open("journey_test.txt", "r")
response = re.split(r"[/|/,\n, , ,:\"\"\.?,)(\-\<>\[\]'\r']",
fin.read())
thesaurus = API_URL + response[word_number] + '/' #API_URL is
established at the start of the code
return thesaurus
yes. Essentially, it grabs each word from a text file and combines
it with
the other stuff to create a url string that I send through an API
to an
online thesaurus. I was attempting to strip it this way as a weak
method for
cleaning out the words I don't want searched from the text file.
Along with the the other functions the code currently scans a text
file and
replaces each of its words with one of their synonyms.. slightly
legible
gibberish, but that's what I'm interested in for now. It is a
project to
help me start learning pyhton as well being intended to take a
different
form in an artwork I'm working on.
thanks.
petef
BTW, constants like API_URL are fine uses for globals.
I can't get my head around this url() function definition, or how it
would be called. It appears that your program looks like:
Open the file and find out how many words are in it.
for each word,
Open the file again, parse the whole thing yet again, to figure out
the nth word. Then throw away the parsing, plus any information about
where in the file the word was found, just keeping a generated URL
use the URL to access a website, looking up a replacement word.
Re-open the file, parse it till you find something resembling the
word involved, then substitute the synonym, and write it back out.
So if you have a file with 1000 words in it, you'll open it and
parse it
2001 times. And part of your symptoms result from the second parsing
trying to replace words that aren't really words.
If I were you, I'd simplify the problem, and solve the simplified
problem in a pretty way, keeping in mind what the complete problem is.
Then expand it incrementally from there.
For example, instead of a website, you can build a map of synonyms
(see
my example earlier). Just a dozen should be fine for testing.
Instead of a file with arbitrary text, you could use a simple string
of
words, without punctuation, capitalization or other complexities.
Now, write a set of functions that solve that problem, and gradually
add
in the complexities of the original problem.
And try to do each operation once, both for efficiency and to avoid
errors when it's slightly different the two times you might do it.
To
me that means the final program should have this kind of flow:
Open the file, and start parsing.
if the next sequence is punctuation and white space, copy it to
the output.
if the next sequence is a word, extract it, call synonym() on it,
and copy that to the output
continue till the infile is done
Perhaps copy the outfile on top of the infile.
See the suggestions for functions I made much earlier in this thread.
DaveA
------------------------------
Message: 5
Date: Mon, 13 Jul 2009 08:08:22 -0400
From: Dave Angel <da...@ieee.org>
To: Markus Hubig <mhu...@gmail.com>
Cc: tutor@python.org
Subject: Re: [Tutor] for statement with addition ...
Message-ID: <4a5b23b6.7030...@ieee.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Markus Hubig wrote:
Hi @all,
within diveintopython I often found a for-statement like this:
f for f in bla:
print f
So what actually is the first f for ... is it just to declare f
before
starting the for loop? I can't find any information on python.org
and it's hard to google this kinda stuff.
- Markus
Please give us a reference, as to exactly where you saw that. It
gives
a syntax error in Python 2.62, as I expected it would. That's not
how a
for statement works.
On the other hand, if you enclose that phrase in square brackets, it
makes a list comprehension.
mylist = [f for f in bla]
A list comprehension builds a new list, where the first pieces says
what
goes into the list, and the second part describes how to generate it.
In this case, if bla is already a list, this just copies the list.
But
consider
mylist = [f*f for f in bla]
That builds a new list from the old, where each item is the square of
the corresponding old item.
List comprehension is something you can look up in the help. Also
look
up generator expression, which uses similar syntax.
DaveA
------------------------------
Message: 6
Date: Mon, 13 Jul 2009 15:44:09 +0200
From: Markus Hubig <mhu...@gmail.com>
To: tutor@python.org
Subject: Re: [Tutor] for statement with addition ...
Message-ID:
<1a3190fd0907130644n7ac6be52y5e672abdfbbf9...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
On Mon, Jul 13, 2009 at 2:08 PM, Dave Angel <da...@ieee.org> wrote:
Markus Hubig wrote:
Hi @all,
within diveintopython I often found a for-statement like this:
f for f in bla:
print f
So what actually is the first f for ... is it just to declare f
before
starting the for loop? I can't find any information on python.org
and it's hard to google this kinda stuff.
- Markus
Please give us a reference, as to exactly where you saw that. It
gives a
syntax error in Python 2.62, as I expected it would. That's not
how a for
statement works.
On the other hand, if you enclose that phrase in square brackets,
it makes
a list comprehension.
mylist = [f for f in bla]
A list comprehension builds a new list, where the first pieces says
what
goes into the list, and the second part describes how to generate
it. In
this case, if bla is already a list, this just copies the list. But
consider
mylist = [f*f for f in bla]
That builds a new list from the old, where each item is the square
of the
corresponding old item.
List comprehension is something you can look up in the help. Also
look up
generator expression, which uses similar syntax.
DaveA
Yes your right, the examples are enclosed in square brackets ...
so this is the explanation I was looking for, thank you.
And now I also found the explanation in
diveintopython<http://diveintopython.org/native_data_types/mapping_lists.html
>!
;-)
- Markus
--
-------------------"it's like this"------
even samurai have teddy bears
and even teddy bears get drunk
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