FASTA Format

Read FASTA sequence files as one record per sequence (stdlib; no extra).

Overview

Property	Value
Format id	fa (aliases fasta, fna, faa)
Class	FASTAIterable
Extensions	.fa, .fasta, .fna, .faa
Read	Yes
Write	No
Extra	none (stdlib)
Maturity	stable

Record shape

{"id": "seq1", "description": "example protein", "sequence": "MKTAYIAK..."}

Usage

from iterable import open_iterable

with open_iterable("genes.fa") as source:
    for rec in source:
        print(rec["id"], len(rec["sequence"]))

See also

• FASTQ — sequences with quality scores
• Supported formats