Simple no-bullshit Fasta reader

fasta.py

import fileinput

def fastaparse():
        fasta = {}
        current_id = None
        buf=""
        for line in fileinput.input():
                if line[0] == ">":
                        if current_id is None:
                                current_id = line[1:].strip()
                        else:
                                fasta[current_id] = buf
                                current_id = line[1:].strip()
                                buf = ""

                else:
                        buf += line.strip()
        return fasta