python: pick fna sequence

import re, sys, os
# 构建序列名-序列字典
with open("protein_rm_enter.faa") as f:
    Dict = {}
    keys = []
    for line in f:
        if line[0] == ">":
            key = line.strip()
            keys.append(key)
            Dict[key] = []
        else:
            Dict[key].append(line.strip())
# 遍历目标序列名，提取目标序列            
with open("protein2.target", 'w') as o:
    with open("apd.target") as target:
        for tar in target:
            tar = tar.strip()
            tar = ">{}_1".format(tar)
            if tar in keys:
                o.write("{}\t{}\n".format(tar, ''.join(Dict[tar])))