/usr/share/pyshared/cogent/parse/ct.py is in python-cogent 1.5.1-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | #!/usr/bin/env python
"""Parser for ct rna secondary structure format
Works on ct files containing one or more structures..
supports: Carnac
dynalign
mfold
sfold
unafold
knetfold
Should work on all ct formats conforming to format:
header, structure, header, structure ...
Header is line beginning every structure, containing length,energy,input file:
72 ENERGY = -23.4 trna_phe.fasta
currently only works on multiple structures files if header lines contain
the word 'Structure', 'ENERGY' or 'dG'. Further support added as needed
Convention of Connect format(ct) is to include 'ENERGY = value' as header above
(value left blank if not applicable)
"""
from string import split,atof
from cogent.struct.rna2d import Pairs
from cogent.struct.pairs_util import adjust_base
__author__ = "Shandy Wikman"
__copyright__ = "Copyright 2007-2011, The Cogent Project"
__contributors__ = ["Shandy Wikman"]
__license__ = "GPL"
__version__ = "1.5.1"
__maintainer__ = "Shandy Wikman"
__email__ = "ens01svn@cs.umu.se"
__status__ = "Development"
def ct_parser(lines=None):
"""Ct format parser
Takes lines from a ct file as input
Returns a list containing sequence,structure and if available the energy.
[[seq1,[struct1],energy1],[seq2,[struct2],energy2],...]
"""
count = 0
length = ''
energy = None
seq = ''
struct = []
result = []
for line in lines:
count+=1
sline = line.split(None,6) #sline = split line
if count==1 or new_struct(line):#first line or new struct line.
if count > 1:
struct = adjust_base(struct,-1)
struct = Pairs(struct).directed()
struct.sort()
if energy is not None:
result.append([seq,struct,energy])
energy = None
else:
result.append([seq,pairs])
struct = []
seq = ''
#checks if energy for predicted struct is given
if sline.__contains__('dG') or sline.__contains__('ENERGY'):
energy = atof(sline[3])
if sline.__contains__('Structure'):
energy = atof(sline[2])
else:
seq = ''.join([seq,sline[1]])
if not int(sline[4]) == 0:#unpaired base
pair = ( int(sline[0]),int(sline[4]) )
struct.append(pair)
#structs are one(1) based, adjust to zero based
struct = adjust_base(struct,-1)
struct = Pairs(struct).directed()
struct.sort()
if energy is not None:
result.append([seq,struct,energy])
else:
result.append([seq,struct])
return result
def new_struct(line):
"""
Determines if a new structure begins on line in question.
Currently only works for multiple structure files containing these key
words in their header.
Convention of Connect format (ct format) is to include 'ENERGY = value'
(value left blank if not applicable)
Support for additional formats will be added as needed
"""
answer=False
if 'Structure' in line or 'dG' in line or 'ENERGY' in line:
answer = True
return answer
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