Represent a Sequence Feature on an object.

Attributes: o location - the location of the feature on the sequence o type - the specified type of the feature (ie. CDS, exon, repeat...) o ref - A reference to another sequence. This could be an accession number for some different sequence. o ref_db - A different database for the reference accession number. o qualifier - A dictionary of qualifiers on the feature. These are analagous to the qualifiers from a GenBank feature table. The keys of the dictionary are qualifier names, the values are the qualifier values. o sub_features - Additional SeqFeatures which fall under this parent feature. For instance, if we having something like:

CDS join(1..10,30..40,50..60)

The the top level feature would be a CDS from 1 to 60, and the sub features would be of CDS_span type and would be from 1 to 10, 30 to 40 and 50 to 60, respectively.

__init__ ( self )

__str__ ( self )