Create a Fasta writer.

Arguments:

• handle - Handle to an output file, e.g. as returned by open(filename, “w”)
• wrap - Optional line length used to wrap sequence lines. Defaults to wrapping the sequence at 60 characters Use zero (or None) for no wrapping, giving a single long line for the sequence.
• record2title - Optional function to return the text to be used for the title line of each record. By default a combination of the record.id and record.description is used. If the record.description starts with the record.id, then just the record.description is used.

You can either use::

handle = open(filename, "w")
writer = FastaWriter(handle)
writer.write_file(myRecords)
handle.close()

Or, follow the sequential file writer system, for example::

handle = open(filename, "w")
writer = FastaWriter(handle)
writer.write_header() 
...
Multiple writer.write_record() and/or writer.write_records() calls
...
writer.write_footer() 
handle.close()

Write a single Fasta record to the file.