Bio::Index::Swissprot(3) Interface for indexing one or more


# Make an index for one or more Swissprot files:
use Bio::Index::Swissprot;
use strict;
my $index_file_name = shift;
my $inx = Bio::Index::Swissprot->new(
-filename => $index_file_name,
-write_flag => 1);
# Print out several sequences present in the index in Genbank
# format:
use Bio::Index::Swissprot;
use Bio::SeqIO;
use strict;
my $out = Bio::SeqIO->new( -format => 'genbank',
-fh => \*STDOUT );
my $index_file_name = shift;
my $inx = Bio::Index::Swissprot->new(-filename => $index_file_name);
foreach my $id (@ARGV) {
my $seq = $inx->fetch($id); # Returns a Bio::Seq object
# alternatively
my ($id, $acc);
my $seq1 = $inx->get_Seq_by_id($id);
my $seq2 = $inx->get_Seq_by_acc($acc);


By default the index that is created uses the AC and ID identifiers as keys. This module inherits functions for managing dbm files from, and provides the basic functionality for indexing Swissprot files and retrieving Sequence objects from them. For best results 'use strict'.

You can also set or customize the unique key used to retrieve by writing your own function and calling the id_parser() method. For example:

   # make the index
   # here is where the retrieval key is specified
   sub get_id {
      my $line = shift;
      $line =~ /^KW\s+([A-Z]+)/i;


Mailing Lists

User feedback is an integral part of the evolution of this and other Bioperl modules. Send your comments and suggestions preferably to one of the Bioperl mailing lists. Your participation is much appreciated.

  [email protected]                  - General discussion  - About the mailing lists


Please direct usage questions or support issues to the mailing list:

[email protected]

rather than to the module maintainer directly. Many experienced and reponsive experts will be able look at the problem and quickly address it. Please include a thorough description of the problem with code and data examples if at all possible.

Reporting Bugs

Report bugs to the Bioperl bug tracking system to help us keep track the bugs and their resolution. Bug reports can be submitted via the web:

AUTHOR - Ewan Birney

Also [email protected], bosborne at


The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _


  Title   : _index_file
  Usage   : $index->_index_file( $file_name, $i )
  Function: Specialist function to index Swissprot format files.
            Is provided with a filename and an integer
            by make_index in its SUPER class.
  Example : 
  Returns : 
  Args    :


  Title   : id_parser
  Usage   : $index->id_parser( CODE )
  Function: Stores or returns the code used by record_id to
            parse the ID for record from a string.
            Returns \&default_id_parser (see below) if not
            set. An entry will be added to
            the index for each string in the list returned.
  Example : $index->id_parser( \&my_id_parser )
  Returns : ref to CODE if called without arguments
  Args    : CODE


  Title   : default_id_parser
  Usage   : $id = default_id_parser( $line )
  Function: The default parser for
            Returns $1 from applying the regexp /^ID\s*(\S+)/
            or /^AC\s+([A-Z0-9]+)/ to the current line.
  Returns : ID string
  Args    : a line string


 Title   : _file_format
 Usage   : Internal function for indexing system
 Function: Provides file format for this database
 Example :
 Returns :
 Args    :