#!/usr/bin/python
with open('seq.txt', 'r') as file:
    interes = [line.strip() for line in file]

with open('all_sequences.fasta', 'r') as file, open('seq.fasta', 'w') as result:
    write = False
    for line in file:
        if line.startswith(">"):
            id = next((i for i in interes if i in line), None)
            write = id is not None
        if write:
            result.write(line)