[Tutor] Printing two elements in a list

kumar s ps_python at yahoo.com
Tue Dec 7 23:09:32 CET 2004


Hello group,
 Thank you very much for your kind replies. In fact I
survived to pull out what I needed by going with
Kent's tip by enumerating on iterator. 

The problem with me is suddenly I embarked on
something big problem and I am surviving it in pieces
by writing pieces of code. 


I have another question:
To be brief:

My list contains some elements that I do not want and
I want to remove unwanted elements in my list:

My TEXT file looks like this:

Name=32972_at
Cell1=xxx	xxx	N	control	32972_at
Cell1=xxx	xxx	N	control	32972_at
Cell1=xxx	xxx	N	control	32972_at
Cell1=xxx	xxx	N	control	32972_at
Name=3456_at
Cell1=xxx	xxx	N	control	3456_at
Cell1=xxx	xxx	N	control	3456_at
Cell1=xxx	xxx	N	control	3456_at
Cell1=xxx	xxx	N	control	3456_at
.........       ...     x       xxxxxxxxxxxxxxx
(34K lines)

I want to remove Name=Xxxx_at identifiers.


My List:
['Name=32972_at',
'Cell1=432\t118\tN\tcontrol\t32972_at\t0\t13\tA\tA\tA\t0\t75952\t-1\t-1\t99\t',
'Cell2=432\t117\tN\tcontrol\t32972_at\t0\t13\tA\tT\tA\t0\t75312\t-1\t-1\t99\t',
'Cell3=499\t632\tN\tcontrol\t32972_at\t1\t13\tC\tC\tC\t1\t404979\t-1\t-1\t99\t']


I tried to resolve in this way:

>>>pat = re.compile('Name')
>>> for i in range(len(cord)):
	x = pat.search(cord[i])
	cord.remove(x)

I know I am wrong here because I do not know how to
search and remove an element in a list. Can any one
please help me. 

on Page 98, chapter Lists and dictionaries of mark
lutz's learning python. It is mentioned in table 6-1 :
L2.append(4)  Methods: grow,sort,search,reverse etc.


Although not much is covered on this aspect in this
book, I failed to do more operations on list. 

Looking forward for help from tutors. 

Thank you. 
Kumar.






--- Kent Johnson <kent37 at tds.net> wrote:

> kumar,
> 
> Looking at the quantity and structure of your data I
> think the search you are doing is going to be 
> pretty slow - you will be doing 4504 * 398169 =
> 1,793,353,176 string searches.
> 
> Where does the seq data come from? Could you
> consolidate the pairs of lines into a single record?
> If 
> you do that and extract the '399:559' portion, you
> could build a dict that maps '399:559' to the 
> full record. Looking up '399:559' in the dictionary
> would be much, much faster than searching the 
> entire list.
> 
> If you have multiple entries for '399:559' you could
> have the dict map to a list.
> 
> Kent
> 
> kumar s wrote:
> > 
> >>>>len(x)
> > 
> > 4504
> > 
> >>>>x[1:10]
> > 
> > ['454:494', '319:607', '319:608', '322:289',
> > '322:290', '183:330', '183:329', '364:95',
> '364:96']
> > 
> >>>>len(seq)
> > 
> > 398169
> > 
> >>>>seq[0:4]
> > 
> > ['>probe:HG-U95Av2:1000_at:399:559;
> > Interrogation_Position=1367; Antisense;',
> > 'TCTCCTTTGCTGAGGCCTCCAGCTT',
> > '>probe:HG-U95Av2:1000_at:544:185;
> > Interrogation_Position=1379; Antisense;',
> > 'AGGCCTCCAGCTTCAGGCAGGCCAA']
> > 
> > 
> > 
> >>>>for ele1 in x:
> > 
> > 	for ele2 in seq:
> > 		if ele1 in ele2:
> > 			print ele2
> > 
> > 			
> > 
> >>probe:HG-U95Av2:31358_at:454:493;
> > 
> > Interrogation_Position=132; Antisense;
> > 
> >>probe:HG-U95Av2:31358_at:319:607;
> > 
> > Interrogation_Position=144; Antisense;
> > 
> > 
> > 
> > 
> > 
> > 
> > How Do I WANT:
> > 
> > I want to print get an output like this:
> > 
> > 
> > 
> >>probe:HG-U95Av2:1000_at:399:559;
> > 
> > Interrogation_Position=1367; Antisense;'
> > TCTCCTTTGCTGAGGCCTCCAGCTT
> > 
> > 
> >>probe:HG-U95Av2:1000_at:544:185;
> > 
> > Interrogation_Position=1379; Antisense;
> > AGGCCTCCAGCTTCAGGCAGGCCAA
> > 
> > 
> > can any one please suggest what is going wrong in
> my
> > statements and how can I get it. 
> > 
> > Thank you.
> > Kumar
> > 
> > 
> > 		
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