Arrays of numbers, optimized for small sizes

 Tinyarray is a numerical array module for Python. The multi-dimensional
 arrays it provides are best thought of as (possibly nested) tuples of numbers
 that, unlike Python's built-in tuples, support mathematical operations. Like
 tuples, tinyarrays are hashable and immutable and thus can be used as
 dictionary keys. The module's interface is a subset of that of NumPy and
 hence should be familiar to many Python programmers. Tinyarray has been
 heavily optimized for small arrays: For example, common operations on 1-d
 arrays of length 3 run 3-7 times faster than with NumPy. When storing many
 small arrays, memory consumption is reduced by a factor of 3. In summary,
 Tinyarray is a more efficient alternative to NumPy when many separate small
 numerical arrays are to be used.