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posted by martyb on Friday July 13 2018, @12:58PM   Printer-friendly
from the pass-it-on dept.

On a python developers' mailing list for the core developers, Python Committers, Benevolent Dictator for Life Guido van Rossum has announced that he is stepping down effective immediately and with out appointing a successor.

Now that PEP 572 is done, I don't ever want to have to fight so hard for a
PEP and find that so many people despise my decisions.

I would like to remove myself entirely from the decision process. I'll
still be there for a while as an ordinary core dev, and I'll still be
available to mentor people -- possibly more available. But I'm basically
giving myself a permanent vacation from being BDFL, and you all will be on
your own.

After all that's eventually going to happen regardless -- there's still
that bus lurking around the corner, and I'm not getting younger... (I'll
spare you the list of medical issues.)

I am not going to appoint a successor.

[...] I'll still be here, but I'm trying to let you all figure something out for
yourselves. I'm tired, and need a very long break.


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  • (Score: 3, Insightful) by Thexalon on Friday July 13 2018, @06:12PM (3 children)

    by Thexalon (636) on Friday July 13 2018, @06:12PM (#706718)

    The other obvious way to handle those situations is to make the assignment and the expression two separate statements, because this really is syntactic sugar we're talking about here.

    In short, this:

    make_breakfast(spam := eggs)

    Versus this:

    spam = eggs
    make_breakfast(spam)

    It is definitely a matter of taste and opinion which one is clearer.

    --
    The only thing that stops a bad guy with a compiler is a good guy with a compiler.
    Starting Score:    1  point
    Moderation   +1  
       Insightful=1, Total=1
    Extra 'Insightful' Modifier   0  
    Karma-Bonus Modifier   +1  

    Total Score:   3  
  • (Score: 1, Interesting) by Anonymous Coward on Friday July 13 2018, @07:10PM (2 children)

    by Anonymous Coward on Friday July 13 2018, @07:10PM (#706743)

    That is true, and a large part of the rationale comes from real world examples suggesting people write code that prefers fewer lines even over more efficient alternatives. Things like

    group = re.match(data).group(1) if re.match(data) else None

    or

    match1 = pattern1.match(data)
    match2 = pattern2.match(data)
    if match1:
            result = match1.group(1)
    elif match2:
            result = match2.group(2)
    else:
            result = None

    generally the new syntax allows for code that is both more readable and more compact. (Once familiar with the new := operand) Those exampels come from the pep, there are many more showing clean improvements it enables in the python source code itself.

    • (Score: 1, Interesting) by Anonymous Coward on Friday July 13 2018, @07:25PM (1 child)

      by Anonymous Coward on Friday July 13 2018, @07:25PM (#706748)

      group = re.match(data).group(1) if re.match(data) else None

      They got sick of people monkey patching the standard lib to use an LRU cache on compiled re patterns or complaining about the performance, so they added it themselves. If you are really concerned about performance from standard constructs like that, then either the programmer or core devs could just do it for that one too. It's even in the same module.

      Your second example is much more readable to me using the suggested alternative rather than the accepted one, plus it has better scoping rules, among other benefits:

      if pattern2.match(data) as match1:
                      result = match1.group(1)
      elif pattern2.match(data) as match2:
                      result = match2.group(2)
      else:
                      result = None

      vs

      if (match1 := pattern1.match(data)):
                      result = match1.group(1)
      elif (match2 := pattern.match(data)):
                      result = match2.group(2)
      else:
                      result = None

      • (Score: 0) by Anonymous Coward on Friday July 13 2018, @07:27PM

        by Anonymous Coward on Friday July 13 2018, @07:27PM (#706750)

        Oops, made some mispels in the last two examples on variable names, but the syntax is correct and my point still stands.