On Mon, Oct 4, 2021 at 11:54 PM Stephen Waterbury <water...@pangalactic.us> wrote: > > On 10/4/21 10:07 AM, Hongyi Zhao wrote: > > On Mon, Oct 4, 2021 at 9:33 PM Robert Kern <robert.k...@gmail.com> wrote: > > On Mon, Oct 4, 2021 at 5:17 AM Hongyi Zhao <hongyi.z...@gmail.com> wrote: > > That’s just the way Python’s syntax works. Operators are not names that can > be resolved to objects that can be compared with the `is` operator. Instead, > when that operator is evaluated in an expression, the Python interpreter will > look up a specially-named method on the operand object (in this case > `__invert__`). Numpy array objects implement this method using `np.invert`. > > If so, which is symlink to which, I mean, which is the original name, > and which is an alias? > > "symlink" and "alias" are probably not the best analogies. The implementation > of `np.ndarry.__invert__` simply calls `np.invert` to do the actual > computation. > > It seems that the above calling/invoking logic/mechanism is not so > clear or easy to understand/figure out only by reading the document, > say, by the following commands in IPython: > > import numpy as np > help(np.invert) > np.invert? > np.info(np.invert) > > You probably want to read the Python Language Reference regarding "Special > Methods": > > https://docs.python.org/3.9/reference/datamodel.html#special-method-names
Thank you for directing me to this helpful documentation. HZ _______________________________________________ NumPy-Discussion mailing list -- numpy-discussion@python.org To unsubscribe send an email to numpy-discussion-le...@python.org https://mail.python.org/mailman3/lists/numpy-discussion.python.org/ Member address: arch...@mail-archive.com
