There are any way that i can transform a input string in to a byopython Seq object?
I try a lot of things and search in the google but not a answer.
Have you read the BioPython manual?
This is spelled out pretty plainly, eg: https://biopython.org/DIST/docs/api/Bio.SeqRecord.SeqRecord-class.html
Can you explain your question with examples? Your question implies the opposite of your title.