Thank you for your responses, Sam and Greg. The do_richcompare function is where my research originally took me, but I feel like I'm still missing some pieces to the puzzle.
Here is my updated research since you posted your responses (I'll attach a pdf copy too): https://docs.google.com/document/d/10zgOMetEQtZCiYFnSS90pDnNZD7I_-MFohSy83pOieA/edit# The summary section, in the middle, is where I've summarized my reading of the source code. Greg, your response here, > Generally what happens with infix operators is that the interpreter > first looks for a dunder method on the left operand. If that method > doesn't exist or returns NotImplemented, it then looks for a dunder > method on the right operand. reads like the contents of the do_richcompare function. What I think I'm missing is how do the dunder methods relate to the tp_richcompare function? Thank you, Jonathan On Fri, May 6, 2022 at 11:55 PM Greg Ewing <greg.ew...@canterbury.ac.nz> wrote: > On 7/05/22 12:22 am, Jonathan Kaczynski wrote: > > Stepping through the code with gdb, we see it jump from the compare > > operator to the dunder-eq method on the UUID object. What I want to be > able > > to do is explain the in-between steps. > > Generally what happens with infix operators is that the interpreter > first looks for a dunder method on the left operand. If that method > doesn't exist or returns NotImplemented, it then looks for a dunder > method on the right operand. > > There is an exception if the right operand is a subclass of the > left operand -- in that case the right operand's dunder method > takes precedence. > > > Also, if you change `x == y` to `y > > == x`, you still see the same behavior, which I assume has to do with > > dunder-eq being defined on the UUID class and thus given priority. > > No, in that case the conparison method of str will be getting > called first, but you won't see that in pdb because it doesn't > involve any Python code. Since strings don't know how to compare > themselves with uuids, it will return NotImplemented and the > interpreter will then call uuid's method. > > -- > Greg > -- > https://mail.python.org/mailman/listinfo/python-list > -- https://mail.python.org/mailman/listinfo/python-list
