3.12.2.5.1.11. sphinx.ext.mathbase.math.copy_attr_concatenate

math.copy_attr_concatenate(attr, value, replace)

If attr is an attribute of self and both self[attr] and value are lists, concatenate the two sequences, setting the result to self[attr]. If either self[attr] or value are non-sequences and replace is True or self[attr] is None, replace self[attr] with value. Otherwise, do nothing.