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  3. Blog post where someone used Python quirks to evaluate false == true

Blog post where someone used Python quirks to evaluate false == true

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  • A [email protected]

    This changed in 3.0 to my knowledge.
    Ref: https://wiki.python.org/moin/Python3.0#f

    W This user is from outside of this forum
    W This user is from outside of this forum
    [email protected]
    wrote last edited by [email protected]
    #8

    That change is about True and False, not true and false. If OP was thinking of the former pair, it would seem my "different identifiers" guess was correct.

    1 Reply Last reply
    3
    • C [email protected]

      Does anyone remember an old blog post where someone used various Python language hacks to override boolean primitives, such that the statement false == true evaluated as true? I'm 90% sure it was python, but maybe it was some other language.

      I've been looking for that post recently, but haven't had any luck.

      Thanks to antagonistic for finding it! I guess it was less of an "exploit", and more of a "please don't touch the loaded foot-gun"

      S This user is from outside of this forum
      S This user is from outside of this forum
      [email protected]
      wrote last edited by [email protected]
      #9

      The builtin names are True and False and they became keywords a while back. true and false are just ordinary variables that you can set to whatever you want.

      Meanwhile, in Forth:

      : 2 3 ; \ define 2 as 3
      2 2 + .  6 ok   \ shows that 2+2 is now 6
      
      undefined@lemmy.hogru.chU 1 Reply Last reply
      11
      • L [email protected]

        Maybe they did "False is True" because they're both the same Python object?

        S This user is from outside of this forum
        S This user is from outside of this forum
        [email protected]
        wrote last edited by
        #10

        I just checked and they aren't.

        L 1 Reply Last reply
        1
        • S [email protected]

          I just checked and they aren't.

          L This user is from outside of this forum
          L This user is from outside of this forum
          [email protected]
          wrote last edited by [email protected]
          #11

          Maybe they defined them as variable names instead?

          Or they could have just changed the language. Do you remember them compiling or editing C? (Python is usually run on cpython)

          S 1 Reply Last reply
          1
          • L [email protected]

            Maybe they defined them as variable names instead?

            Or they could have just changed the language. Do you remember them compiling or editing C? (Python is usually run on cpython)

            S This user is from outside of this forum
            S This user is from outside of this forum
            [email protected]
            wrote last edited by
            #12

            True is False gives false in Python 2.7.18 as well as 3.x. But, in 2.x, they aren't keywords, so you can say True=False=5 and then they are both the same object.

            L 1 Reply Last reply
            1
            • S [email protected]

              True is False gives false in Python 2.7.18 as well as 3.x. But, in 2.x, they aren't keywords, so you can say True=False=5 and then they are both the same object.

              L This user is from outside of this forum
              L This user is from outside of this forum
              [email protected]
              wrote last edited by
              #13

              I really need to stop trusting how durable this language is.

              1 Reply Last reply
              0
              • E [email protected]

                I feel like you hear fuckery like that more in JavaScript.

                E This user is from outside of this forum
                E This user is from outside of this forum
                [email protected]
                wrote last edited by
                #14

                Wat

                1 Reply Last reply
                7
                • S [email protected]

                  The builtin names are True and False and they became keywords a while back. true and false are just ordinary variables that you can set to whatever you want.

                  Meanwhile, in Forth:

                  : 2 3 ; \ define 2 as 3
                  2 2 + .  6 ok   \ shows that 2+2 is now 6
                  
                  undefined@lemmy.hogru.chU This user is from outside of this forum
                  undefined@lemmy.hogru.chU This user is from outside of this forum
                  [email protected]
                  wrote last edited by
                  #15

                  God I hated that about Python. Why tf we capitalizing True and False?

                  lime@feddit.nuL S 2 Replies Last reply
                  3
                  • undefined@lemmy.hogru.chU [email protected]

                    God I hated that about Python. Why tf we capitalizing True and False?

                    lime@feddit.nuL This user is from outside of this forum
                    lime@feddit.nuL This user is from outside of this forum
                    [email protected]
                    wrote last edited by
                    #16

                    all builtin constants are capitalised.

                    R S 2 Replies Last reply
                    3
                    • undefined@lemmy.hogru.chU [email protected]

                      God I hated that about Python. Why tf we capitalizing True and False?

                      S This user is from outside of this forum
                      S This user is from outside of this forum
                      [email protected]
                      wrote last edited by
                      #17

                      They are constants, like None, which has always been around.

                      1 Reply Last reply
                      2
                      • lime@feddit.nuL [email protected]

                        all builtin constants are capitalised.

                        R This user is from outside of this forum
                        R This user is from outside of this forum
                        [email protected]
                        wrote last edited by [email protected]
                        #18

                        All… five of them!

                        The other 7 are all lowercase. (One of you ignore site)

                        lime@feddit.nuL 1 Reply Last reply
                        1
                        • R [email protected]

                          All… five of them!

                          The other 7 are all lowercase. (One of you ignore site)

                          lime@feddit.nuL This user is from outside of this forum
                          lime@feddit.nuL This user is from outside of this forum
                          [email protected]
                          wrote last edited by
                          #19

                          yeah but dunders usually aren't included in counts

                          1 Reply Last reply
                          1
                          • lime@feddit.nuL [email protected]

                            all builtin constants are capitalised.

                            S This user is from outside of this forum
                            S This user is from outside of this forum
                            [email protected]
                            wrote last edited by
                            #20

                            And they also don't follow the conventions for constants otherwise, which are all caps.

                            lime@feddit.nuL 1 Reply Last reply
                            0
                            • S [email protected]

                              And they also don't follow the conventions for constants otherwise, which are all caps.

                              lime@feddit.nuL This user is from outside of this forum
                              lime@feddit.nuL This user is from outside of this forum
                              [email protected]
                              wrote last edited by
                              #21

                              i think we're talking about different things.

                              1 Reply Last reply
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