v2.1

The primary focus of this release was on improving the documentation, though there are a few small feature enhancements.

• added support for SI standard composite units
• added support for non-breaking space as spacer
• removed constraint in extract() that names must be identifiers

v2.0

This is a 'coming of age' release where the emphasis shifts from finding the right interface to providing an interface that is stable over time. This release includes the first formal documentation and a number of new features and refinements to the API.

• created formal documentation
• enhanced label_fmt to accept {V}
• allow quantity to be passed as value to Quantity
• replaced Quantity.add_to_namespace with Quantity.extract
• raise NameError rather than Assertion for unknown preferences
• added Quantity.all_from_conv_fmt() and Quantity.all_from_si_fmt()
• change assign_rec to support more formats
• changed Constant() to add_constant()
• changed the way preferences are implemented
• changed name of preference methods: set_preferences -> set_prefs, get_preference -> get_pref
• added Quantity.prefs() (preferences context manager)
• split label_fmt preference into two: label_fmt and label_fmt_full
• added show_desc preference
• allow show_label to be either 'a' or 'f' as well True or False
• renamed strip_dp option to strip_radix
• added number_fmt option

v1.3

Reworks constants and adds support for both mks and cgs constants.