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
<https://docs.python.org/3.9/reference/datamodel.html#special-method-names>
HTH,
Steve
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