writer.py

import os
class Writer(object):
    def __init__(self, base_dir):
        self.base_dir = base_dir

        self.pool = {}

    def _get_fh(self, name):
        if name not in self.pool:
            self.pool[name] = open(os.path.join(self.base_dir, name), "w")
        return self.pool[name]

    def write(self, name, data):
        fh = self._get_fh(name)
        fh.write(data)

    def clost(self):
        for _, fh in self.pool:
            fh.close()