Thank you all for thoughts. I'm just about to post another question about atoms and primaries. If you have a moment to look it over, I would appreciate your thoughts.
Many thanks in advance. On Tuesday, April 16, 2013 6:19:25 PM UTC-4, Bruce McGoveran wrote: > Hello. I am new to this group. I've done a search for the topic about which > I'm posting, and while I have found some threads that are relevant, I haven't > found anything exactly on point that I can understand. So, I'm taking the > liberty of asking about something that may be obvious to many readers of this > group. > > > > The relevant Python documentation reference is: > http://docs.python.org/2/reference/expressions.html#boolean-operations. > > > > I'm trying to make sense of the rules of or_test, and_test, and not_test that > appear in this section. While I understand the substance of the text in this > section, it is the grammar definitions themselves that confuse me. For > example, I am not clear how an or_test can be an and_test. Moreover, if I > follow the chain of non-terminal references, I move from or_test, to > and_test, to not_test, to comparison. And when I look at the definition for > comparison, I seem to be into bitwise comparisons. I cannot explain this. > > > > Perhaps an example will help put my confusion into more concrete terms. > Suppose I write the expression if x or y in my code. I presume this is an > example of an or_test. Beyond that, though, I'm not sure whether this maps > to an and_test (the first option on the right-hand side of the rule) or to > the or_test "or" and_test option (the second on the right-hand side of the > rule). > > > > If people can offer some thoughts to put me in the right direction (or out of > my misery), I would appreciate it. > > > > Thank you in advance. -- http://mail.python.org/mailman/listinfo/python-list
