#! /usr/bin/env python

class Fasta:
    def __init__(self, name, sequence):
        self.name = name
        self.sequence = sequence

def read_fasta(file):
    items = []
    index = 0
    for line in file:
        if line.startswith(">"):
           if index >= 1:
               items.append(aninstance)
           index+=1
           name = line.strip()
           seq = ''
           aninstance = Fasta(name, seq)
        else:
           seq += line.strip()
           aninstance = Fasta(name, seq)

    items.append(aninstance)
    return items

def read_seqs(file):
    items = []
    seq = ''
    index = 0
    for line in file:
        if line.startswith(">"):
            if index >= 1:
                items.append(seq)
                seq = ''
            index += 1
        else:
            seq += line[:-1]

    items.append(seq)
    return items

def format_output(sequence, length):
    temp = []
    for j in range(0,len(sequence),length):
        temp.append(sequence[j:j+length])
    return '\n'.join(temp)


def complement(seq):
    complement = {'A': 'T', 'C': 'G', 'G': 'C', 'T': 'A'}
    complseq = [complement[base] for base in seq]
    return complseq

def reverse_complement(seq):
    seq = list(seq)
    seq.reverse()
    return ''.join(complement(seq))

def transcribe(seq):
    RNA = seq.replace('T', 'U')  
    return RNA