hi, thank you. this is not a homework question.
I have a very huge file of fasta sequence. > GeneName xxxxxxxx \t yyyyyyyy AATTAAGGAAAAAA.......... (1000 lines) AATAAGGA >GeneName xxxxxxxx \t yyyyyyyy GGAGAGAGATTAAGAA (15000 lines) when I read this as: f2= open('myfile','r') dat = f2.read().split('\n') turned out to be very expensive deal on computer. Instead I tried this: dat = f2.read() (reading into jumbo file of 19,100,442,1342 lines is easy but getting into what i want is a problem). I want to create a dictionary where 'GeneName' as key and sequence of ATGC characters as value biglist = dat.split('\t') ['GeneName xxxxxxxx','yyyyyyyy','ATTAAGGCCAA'.......] Now I want to select ''GeneName xxxxxxxx' into listA and 'ATTAAGGCCAA' into listB so I want to select 0,3,6,9 elements into listA and 2,5,8,11 and so on elements into listB then I can do dict(zip(listA,listB)) however, the very loops concept is getting blanked out in my brain when I want to do this: for j in range(len(biglist)): from here .. I cannot think anything.. may be it is just mental block.. thats the reason I seek help on forum. Thanks --- jim stockford <[EMAIL PROTECTED]> wrote: > > keep a counter in your loop. is this a homework > question? > > On Sep 23, 2006, at 8:34 AM, kumar s wrote: > > > hi, > > > > the reason could be that I did not quite > understand > > the concept of looping > > > > I have a list of 48 elements > > > > I want to create another two lists , listA and > listB > > > > I want to loop through the list with 48 elements > and > > > > select element with index 0,3,6,9,12 ..etc into > listA > > > > select elements with index 2,5,8,11 etc into > listB. > > > > > > Could any one help me how can I do that > > > > thankyou > > > > __________________________________________________ > > Do You Yahoo!? > > Tired of spam? Yahoo! Mail has the best spam > protection around > > http://mail.yahoo.com > > _______________________________________________ > > Tutor maillist - Tutor@python.org > > http://mail.python.org/mailman/listinfo/tutor > > > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor