select lines in python

[amrita at iisermohali.ac.in]

Can i become more precise like instead of printing all lines for PHE and
ASP is it possible that for PHE python will print only those lines which
will have information about H and HA and for ASP it will print those lines
which will have information about HA and HB.

Thanks


> On Tue, 14 Jul 2009 18:48:06 +0100, David Gibb <degibb at gmail.com> wrote:
>
> [Something top-posted, which I've shuffled down]
>
>> On Tue, Jul 14, 2009 at 1:33 PM, <amrita at iisermohali.ac.in> wrote:
>>> Dear all,
>>>
>>> Can anyone tell me that suppose i have a file having content like:
>>>
>>> Â  Â _Atom_name
>>> Â  Â  Â _Atom_type
>>> Â  Â  Â _Chem_shift_value
>>> Â  Â  Â _Chem_shift_value_error
>>> Â  Â  Â _Chem_shift_ambiguity_code
>>> Â  Â  1 Â  Â  1 Â  PHE Â  Â  Â  H Â  Â  H Â  Â  Â 8.49 Â  Â  0.02 Â  Â 
>>> 1
>>> Â  Â  2 Â  Â  1 Â  PHE Â  Â  Â  HA Â  Â H Â  Â  Â 4.60 Â  Â  0.02 Â  Â 
>>> 1
>>> Â  Â  3 Â  Â  1 Â  PHE Â  Â  Â  CA Â  Â C Â  Â  57.83 Â  Â  Â 0.3 Â  Â 
>>> 1
>>> Â  Â  4 Â  Â  2 Â  LEU Â  Â  Â  H Â  Â  H Â  Â  Â 8.23 Â  Â  0.02 Â  Â 
>>> 1
>>> Â  Â  5 Â  Â  2 Â  LEU Â  Â  Â  HA Â  Â H Â  Â  Â 4.25 Â  Â  0.02 Â  Â 
>>> 1
>>> Â  Â  6 Â  Â  2 Â  LEU Â  Â  Â  HB2 Â  H Â  Â  Â 1.54 Â  Â  0.02 Â  Â 
>>> 1
>>> Â  Â  7 Â  Â  3 Â  ASP Â  Â  Â  H Â  Â  H Â  Â  Â 8.10 Â  Â  0.02 Â  Â 
>>> 1
>>> Â  Â  8 Â  Â  3 Â  ASP Â  Â  Â  HA Â  Â H Â  Â  Â 4.52 Â  Â  0.02 Â  Â 
>>> 1
>>> Â  Â  9 Â  Â  3 Â  ASP Â  Â  Â  HB2 Â  H Â  Â  Â 2.65 Â  Â  0.02 Â  Â 
>>> 1
>>> stop
>>>
>>>
>>> now what i want that instead of copying all the lines it will just
>>> write
>>> the information about PHE and ASP then how i acn do that using python
>>> programming.Kindly tell me the command for that.
>
>> try something like:
>>
>> for line in open("filename").readlines():
>>     if (re.search("PHE|ASP",line):
>>         print line
>>
>
> The readlines() is unnecessary, and if your file is at all long you'd
> be better off precompiling the regular expression.
>
> import re
>
> expr = re.compile("PHE|ASP")
> with open("filename") as f:
>      for line in f:
>          if expr.search(line):
>              print line
>
> --
> Rhodri James *-* Wildebeest Herder to the Masses
> --
> http://mail.python.org/mailman/listinfo/python-list
>


Amrita Kumari
Research Fellow
IISER Mohali
Chandigarh
INDIA