On Wednesday, June 22, 2016 at 3:40:22 PM UTC+12, Elizabeth Weiss wrote: > I am a little confused as to how this is False: > > False==(False or True) > > I would think it is True because False==False is true. > > I think the parenthesis are confusing me.
No, it is the meanings of the boolean operators in Python. The rules are: * boolean operators don’t have to operate on boolean values. The language spec <https://docs.python.org/3/reference/expressions.html#boolean-operations> says: “...the following values are interpreted as false: False, None, numeric zero of all types, and empty strings and containers (including strings, tuples, lists, dictionaries, sets and frozensets). All other values are interpreted as true.” I feel that’s a needlessly complicated rule. It would have been simpler if boolean operators (and conditional expressions like in if-statements and while-statements) only allowed values of boolean types. But that’s one of the few warts in the design of Python... * the meaning of “A or B” is: “return A if it evaluates to true, else return B”. Correspondingly, the meaning of “A and B” is: “return A if it evaluates to false, else return B”. Does that give you enough clues to understand what is going on? -- https://mail.python.org/mailman/listinfo/python-list
