[pypy-dev] Python 3 ...

Armin Rigo arigo at tunes.org
Fri May 24 01:00:49 CEST 2013

Hi all,

Unrelated to everything, a comment about Python 3's unrivalled syntax.
You can now be hesitant in your programs!  Try it out:

    if len(x) > 0 and... and... and x[0] == 5:

More seriously, I'm used to type "..." somewhere to mean "fix me
first!".  I didn't move to Python 3 so far, but if I had to pick a
reason, this one would be high on the list.  Now the program will
associate a useless meaning to my "..." and try to execute it.  Even
worse, in the usual case (a line containing only "...") it will work:
the line is completely ignored!  You can write this:

    def foo():
        x = ...

and actually execute foo() without getting any error.  Likely you'll
end with a crash later because this call to foo() didn't have the
expected effect, which you did not implement so far.  Same with
"assert...", which just passes.  Great!

I guess I just have to remember: use 4 dots, never 3.



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