On Sun, Sep 27, 2020 at 07:59:18AM -0300, Sebastian Kreft wrote: > Hi Steven, could you share some examples of what you have in mind. Having a > more concrete example of an API that would benefit from mixed-subscripting > would allow us to better understand its usefulness.
I have an experimental Matrix class: https://en.wikipedia.org/wiki/Matrix_(mathematics) There are (at least) three indexing operations needed: - row - column - individual cell The first two support get, set and delete; the last supports only get and set. One obvious API would be a keyword to disambiguate between the first two cases: matrix[3, 4] # unambiguously a cell reference matrix[3] # ambiguous, forbidden matrix[3, axis='row'] # unambiguously a row matrix[3, axis='col'] # unambiguously a column These could be supported for all of get, set and delete (except for cells) operations. A quick sketch of the implementation with minimal error checking for brevity: def __setitem__(self, index, value, *, axis=None): if isinstance(index, tuple): # Operate on a cell. if axis is not None: raise TypeError('cell ops don't take axis keyword') i, j = index ... # bind a single cell elif isinstance(index, int): if axis == 'row': ... # bind the row elif axis == 'col': ... # bind the column else: raise ValueError('bad axis') else: raise TypeError -- Steve _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/CGMHA4LIE6EIFJWLQ5SEMLQWPKRCIY2V/ Code of Conduct: http://python.org/psf/codeofconduct/
