How to search through a fasta file and print out the sequence associated with a record name.

abimbola.py

from Bio import SeqIO


def fasta_search(fastas, target):
    """
    Search for a sequence motif in multiple FASTA records.

    Args:    fastas - SeqIO iterable
             target - the sequence name to find (string)
    Returns: Nothing.
    """
    for record in fasta_batch:
        if target == record.name:
            print(record.seq)


# assign name of file to variable
filename = "five_seqs.fas"
# parse in my fasta file
fasta_batch = list(SeqIO.parse(filename, "fasta"))
# declare what I am looking for, as a string
seq_name = "seq3"

# call the function!
fasta_search(fasta_batch, seq_name)

an example input file would be

> seq1
ABC

> seq2
DEF

> seq3
HIJ

> seq4
KLM

> seq5
NOP