|The stupid question is the question not asked|
Re: add letters to the begin of the sentenceby Kenosis (Priest)
|on Sep 12, 2013 at 17:56 UTC||Need Help??|
Since you're working with fasta files, consider becoming familiar with Bio::SeqIO--a module that's a powerful tool for working with fasta and other such formats.
For example, to achieve your desired results using the module, you can do the following:
Notice that the module permits you to access sequences and ids as objects, using the "->" notation. For example, in the above, we prepend "aaaa" to the original sequence by doing the following:
Then, create a new object with the modified sequence that's written to a new file.
The module offers many more options for working with fasta (and other similarly formatted) files.
Hope this helps!