I have looked (honestly!) and cannot see an array structure to allow different
datatypes per column. I need a 2 column array with column 1 = an integer and
column 2 = chars, and after populating the array, sort on column 2 with column
1 sorted relatively.
Thanks!
Dinesh
Thanks Steve. How do you sort on the second element of each list to get:
a' = [[42, 'fish'],
[1, 'hello']
[2, 'world']
]
From: Steve Willoughby
Sent: Monday, September 22, 2008 8:16 PM
To: Dinesh B Vadhia
Cc: tutor@python.org
Subj
I'm using defaultdict(set) to store a dictionary d = {value : set_items} where
value = integer and set_items = set() of characters and it works perfectly.
I would like to also store the length of the set ie. l = len(set_items) with
the dictionary but don't how to do it using a defaultdict(). A
I have a large number of xml files that I want to convert into text format.
What is the best and easiest way to do this? Thanks!
Dinesh
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Yes, that's exactly what I was looking for. Brilliant!
From: Kent Johnson
Sent: Friday, October 24, 2008 10:59 AM
To: Dinesh B Vadhia
Cc: tutor@python.org
Subject: Re: [Tutor] XML to text
On Fri, Oct 24, 2008 at 11:54 AM, Dinesh B Vadhia
<[EMAIL PROTECTED]> wrote:
> I have
I need to process a large number (> 20,000) of long and variable length lists
(> 5,000 elements) ie.
for element in long_list:
# the result of this operation is not a
list
The performance is reasonable but I wonder if there are faster Python methods?
Dinesh
Bob: Nothing special is being done on the elements of the list -
additions/subtractions/ - and storing the results in an array. That's it.
Dinesh
From: bob gailer
Sent: Thursday, October 30, 2008 11:40 AM
To: Dinesh B Vadhia
Cc: tutor@python.org
Subject: Re: [Tutor] fast list trav
Here is an interesting result with defaultdict(set). This program creates 2
dictionaries of sets with the first dictionary containing 10 elements per set
and the second containing 25 elements. You'll see the sets in the first
dictionary are unordered and in the second they are ordered.
impor
a for-loop.
Btw, cannot move to Python 2.6 or 3.0 until Numpy/Scipy catches up.
Dinesh
From: wesley chun
Sent: Thursday, October 30, 2008 3:06 PM
To: Dinesh B Vadhia
Cc: tutor@python.org
Subject: Re: [Tutor] fast list traversal
based on the all the performance questions, i would say agree
Hi Kent
The code is very simple:
dict_long_lists = defaultdict(list)
for long_list in dict_long_lists.itervalues()
for element in long_list:
array_a[element] = m + n + p# m,n,p are numbers
The long_list's are read from a defaultdict(list) dictionary and so don't n
I want to pickle a bunch of lists and write each list separately to a fileand
then read them back. Here is my code with the EOF error:
import cPickle as pickle
m = [[1, 2, 3, 4], [5, 6, 7, 8, 9, 10], [11, 12, 13, 14]]
filename = 'lists.txt'
fw = open(filename, 'w')
for l in m:
n = pick
, 2008 at 6:15 AM, Lie Ryan gmail.com> wrote:
> On Sun, 02 Nov 2008 23:20:47 -0800, Dinesh B Vadhia wrote:
>
>> I want to pickle a bunch of lists and write each list separately to a
>> fileand then read them back.
> To solve your problem, you have several alternative possib
I'm trying to get my head around the Decimal module to understand how to
represent a decimal floating point number as an integer (or integers). Am I
barking mad or is this possible?
Dinesh
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To: tutor@python.org
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
"Dinesh B Vadhia" <[EMAIL PROTECTED]> wrote
> I'm trying to get my head around the Decimal module to
> understand how
I'm reading gzip files and writing the content out to a text file line by line.
The code is simply:
import gzip
list_zipfiles = dircache.listdir(zipfolder)
writefile = "out_file.txt"
fw = open(writefile, 'w')
for ziparchive in list_zipfiles:
zfile = gzip.GzipFile(zipfolder + ziparchive, "r
ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
"Dinesh B Vadhia" <[EMAIL PROTECTED]> wrote
> I'm reading gzip files and writing the content out to a text file
> line by line.
> File "C:\P
I ask this question in trepidation but does anyone have experience of Python on
64-bit Windows Vista - there I said it! Feedback on performance and memory
usage would be useful to know. Thanks!
Dinesh___
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offending file and move on to the next file in the list. How do
I achieve this with this particular type of error?
Dinesh
From: Dinesh B Vadhia
Sent: Sunday, November 30, 2008 2:51 PM
To: tutor@python.org
Subject: Reading gzip files
I'm reading gzip files and writing the content out
I want to traverse an xml file and at each node retain the full path from the
parent to that node ie. if we have:
this is node b
this is node c
this is node d
this is node e
... then require:
this is node b
this is node c
t
i've got most of this working now so hold off (for now). thanks.
dinesh
From: Dinesh B Vadhia
Sent: Saturday, January 24, 2009 8:31 PM
To: tutor@python.org
Subject: Traversing XML Tree with ElementTree
I want to traverse an xml file and at each node retain the full path from the
p
Hi! I'm using 32-bit Python on Windows 64-bit Vista (instead of 64-bit Python
because I also use Numpy/Scipy which doesn't offer 64-bit versions yet). I'm
doing some very simple text processing ie. given a string s, find a subtring
using s.find(). But, the program doesn't find all instances o
Hi! I want to process text that contains citations, in this case in legal
documents, and pull-out each individual citation. Here is a sample text:
text = "Page 500 Carter v. Jury Commission of Greene County, 396 U.S. 320, 90
S.Ct. 518, 24 L.Ed.2d 549 (1970); Lathe Turner v. Fouche, 396 U.S. 34
n petit jury, he would clearly have
standing to challenge the systematic exclusion of any identifiable group from
jury service."
Okay, I'd better get to grips with pyparsing!
Dinesh
From: Kent Johnson
Sent: Saturday, February 07, 2009 6:21 AM
To: Dinesh B Vadhia
Cc: tutor@pytho
, 493 U.S. 146, 159-60 (1934)"
I didn't know about pyparsing which appears to be very powerful and have joined
their list. Thank-you for your help.
Dinesh
From: Kent Johnson
Sent: Saturday, February 07, 2009 1:19 PM
To: Dinesh B Vadhia
Cc: tutor@python.org
Subject: Re: [Tutor]
Kent /Emmanuel
Below are the results using the PLY parser and Regex versions on the attached
'sierra' data which I think covers the common formats. Here are some 'fully
unparsed" citations that were missed by the programs:
Smith v. Wisconsin Dept. of Agriculture, 23 F.3d 1134, 1141 (7th Cir.1
Kent /Emmanuel
I found a list of words before the first word that can be removed which I think
is the only way to successfully parse the citations. Here they are:
| E.g. | Accord | See |See + Also | Cf. | Compare | Contra | But + See | But +
Cf. | See Generally | Citing | In |
Dinesh
I want to sort two sequences with different data types but both with an equal
number of elements eg.
f = [0.21, 0.68, 0.44, ..., 0.23]
i = [6, 18, 3, ..., 45]
The obvious solution is to use zip ie. pairs = zip(f,i) followed by
pairs.sort(). This is fine but my sequences contain 10,000+ element
11:16:30 +1100
From: Steven D'Aprano
To: tutor@python.org
Subject: Re: [Tutor] Sorting multiple sequences
Message-ID: <4d7abb5e.9080...@pearwood.info>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Dinesh B Vadhia wrote:
> I want to sort two sequences with different
In the Python documentation
(http://docs.python.org/library/sqlite3.html?highlight=sqlite#using-shortcut-methods)
it says:
"Using the nonstandard execute(), executemany() and executescript() methods of
the Connection object, your code can be written more concisely because you
don't have to crea
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