Commons of Python micro-functions. This basically an out-sourced, shared utils module.
Rules:
- Must work in Python 2 and Python 3
- Cannot depend on anything but six and the standard library
is_sequence: check if something is list-ishis_mapping: check if an object is dict-ishensure_list: make sure an argument is a list, or make it into a single-element listclean_dict: remove null values from a dict, recursivelydecode_path: decode a path name to be unicodehash_data: generate a SHA1 from a dict of reasonable objects