The pyjson-tricks package brings several pieces of functionality to python handling of json files: Store and load numpy arrays in human-readable format. Store and load class instances both generic and customized. Store and load date/times as a dictionary (including timezone). Preserve map order {} using OrderedDict. Allow for comments in json files by starting lines with #. Sets, complex numbers, Decimal, Fraction, enums, compression, duplicate keys, pathlib Paths ... As well as compression and disallowing duplicate keys. Code: https://github.com/mverleg/pyjson_tricks Documentation: http://json-tricks.readthedocs.org/en/latest/ PIP: https://pypi.python.org/pypi/json_tricks