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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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  • 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"

    A This user is from outside of this forum
    A This user is from outside of this forum
    [email protected]
    wrote last edited by
    #5

    This?

    C 1 Reply Last reply
    18
    • W [email protected]

      Python doesn't have true or false keywords, nor any other primitives by those names.

      So either you're thinking of a different language, or different identifiers, or someone assigned equal values to variables with those names and then blogged about it.

      A This user is from outside of this forum
      A This user is from outside of this forum
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      wrote last edited by
      #6

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

      W 1 Reply Last reply
      2
      • A [email protected]

        This?

        C This user is from outside of this forum
        C This user is from outside of this forum
        [email protected]
        wrote last edited by
        #7

        Yes! Thanks

        1 Reply Last reply
        7
        • 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
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              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
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                  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
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                                  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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