def __enter__(self):
for fname in self.fnames:<EOL><INDENT>pfx = fname if self._tmpprefix is None else self._tmpprefix<EOL>self._fids.append(<EOL>tempfile.NamedTemporaryFile(<EOL>mode='<STR_LIT:w>', prefix=pfx, delete=False))<EOL><DEDENT>return self<EOL>
Create temporary files