[BioPython] RecordFile

[Ramu Chenna]

>
> The implementation is based on a state machine. and assumes sequential
> access.
> RecordRead.read provides the same interface as read.  It has an optional
> parameter, size.
>
> RecordFile.read, with no parameters, searches for the next record and
> returns
> it in its entirety.  A subsequent call returns an empty string to signal the
> end of the record.  However, the next call will advance to the next record
> and return it, it it exists.  Otherwise RecordFile.read will return a second
>  empty string.

the idea is nice, start and end tag is a fasterway to fetch a record from
flat file.


subsequent call should return the next record and empty string should be
used to mark for end of file. Something like

	while 1:
		e = db.nextrecord()
		if not e:
			break

Otherwise making two calls to fetch an entry, i think, unnecessary (pardon
me if i am wrong....)

I did something like this, have a look at biopython's script central under
PySAT.

Ramu


>
> If a calling program passes a size parameter RecordFile will check its own
> position with respect to record data. If it just past the end of record, it
> will return an empty string.  If it is between records it will advance to
> the next record and retuurn the specified number of bytes from the record,
> if they are available.  Otherwise, it will return all the data remaining in
> the current record.  If it is already within the record, RecordFile.read
> will return data from the current position.
>
>                          Cayte
>
>
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