python-bitarray 0.8.1-1build4 (s390x binary) in ubuntu artful

 The bitarry module provides an object type which efficiently represents an
 array of booleans. Bitarrays are sequence types and behave very much like
 usual lists. Eight bits are represented by one byte in contiguous block of
 memory. The user can select between two representations; little-endian and
 big-endian.
 .
 Most of the functionality is implemented in C. Methods for accessing the
 machine representation are provided. This can be useful when bit level access
 to binary files is required, such as portable bitmap image files (.pbm). Also,
 when dealing with compressed data which uses variable bit length encoding, you
 may find this module useful.