view allpy/fileio.py @ 429:7ebeae6eea65
fix MsfIo
save_string should not try to read msf file before saving
file should be closed only before giving it to seqret
| author |
boris <bnagaev@gmail.com> |
| date |
Mon, 14 Feb 2011 22:17:44 +0300 |
| parents |
0bd118c2d72b |
| children |
5dfb9b9761d5 |
line source
2 from tempfile import NamedTemporaryFile
7 """ Base class providing alignment/sequence import and export
13 def __init__(self, file):
16 def save_string(self, string, name, description=''):
17 """ Saves given string to file
19 Splits long lines to substrings of length=long_line
20 To prevent this, set long_line=None
24 def get_all_strings(self):
25 """Parse fasta file, remove spaces and newlines from sequence bodies.
27 Return a list of tuples (name, description, sequence_body).
31 def get_string(self, name):
32 """ return tuple (name, description, string) for sequence with name name """
33 for name_test, description, body in self.get_all_strings():
35 return (name_test, description, body)
37 class FastaIo(BaseIo):
38 """ Fasta import and export
41 * long_line - max length of file line while export
42 Splits long lines to substrings of length=long_line
43 To prevent this, set long_line=None
46 def __init__(self, file, long_line=70):
47 BaseIo.__init__(self, file)
48 self.long_line = long_line
50 def save_string(self, string, name, description=''):
52 name += " " + description
53 self.file.write(">%s\n" % name)
55 for i in range(0, len(string) // self.long_line + 1):
56 start = i*self.long_line
57 end = i*self.long_line + self.long_line
58 self.file.write("%s\n" % string[start:end])
60 self.file.write("%s\n" % string)
62 def get_all_strings(self):
63 for part in self.file.read().split("\n>"):
64 header, _, body = part.partition("\n")
65 header = header.lstrip(">").strip()
66 name, _, description = header.partition(" ")
68 description = description.strip()
69 body = util.remove_each(body, " \n\r\t\v")
70 yield (name, description, body)
72 def get_string(self, name):
73 for name_test, description, body in self.get_all_strings():
75 return (name_test, description, body)
78 """ Msf import and export """
80 def __init__(self, file):
81 BaseIo.__init__(self, file)
83 def save_string(self, string, name, description=''):
84 tmp_fasta = NamedTemporaryFile('w', delete=False)
85 fasta = FastaIo(tmp_fasta)
86 fasta.save_string(string, name, description)
89 os.system("seqret %(fasta)s msf::%(msf)s" % \
90 {'msf': self.file.name, 'fasta': tmp_fasta.name})
91 os.unlink(tmp_fasta.name)
92 self.file = open(self.file.name)
94 def get_all_strings(self):
95 tmp_fasta = NamedTemporaryFile(delete=False)
96 os.system("seqret %(msf)s %(fasta)s" % \
97 {'msf': self.file.name, 'fasta': tmp_fasta.name})
98 fasta = FastaIo(tmp_fasta)
99 strings = list(fasta.get_all_strings())
100 os.unlink(tmp_fasta.name)
