<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def unzip(self, directory):
 """ Write contents of zipfile to directory """

        if not os.path.exists(directory):
            os.makedirs(directory)
        shutil.copytree(self.src_dir, directory)