numpy.lib.array_utils

byte_bounds(a)

Returns pointers to the end-points of an array.

normalize_axis_index(axis, ndim[, msg_prefix])

Normalizes an axis index, axis, such that is a valid positive index into the shape of array with ndim dimensions.

normalize_axis_tuple(axis, ndim[, argname, ...])

Normalizes an axis argument into a tuple of non-negative integer axes.