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I wish I could downvote. I specifically said I hate the tuple unpacking syntax change in lambdas. That's where I used it so much to begin with, not in defs! I o

I wish I could downvote. I specifically said I hate the tuple unpacking syntax change in lambdas. That's where I used it so much to begin with, not in defs! I obviously can't put statements like that in lambdas, and until now I didn't need to do that to make my code readable. Now I have to name all of my lambdas just to make this syntax work, which is nonsense. It used to be there and it worked perfectly fine.

rndgermandude 10y ago
Lambdas are not really pythonic these days anyway list(map(lambda (some, thing): some + thing, everything)) # better list(some + thing for (some, thing) in everything) Or, as the parent suggests, just create helper function, preferably one your python environment doesn't need to set up every time your outer function is called # okish, "verbose lambda" def compute(everything): def magic(elem): some, thing = elem return some + thing return list(map(magic, everything)) # probably better def magic(some, thing): return some + thing def compute(everything): return list(magic(some, thing) for (some, thing) in everything)
- wfunction 10y ago
  > Lambdas are not really pythonic these days anyway Too much nonsense in your comment. Really now? How about you give a realistic example where syntactic sugar doesn't substitute for it? Like what am I supposed to pass to sort(key)? And incidentally, this tuple unpacking problem comes up when sorting frequently... and that's the prime example on their web page (and a realistic one at that) for where you're supposed to use lambdas: https://docs.python.org/3/tutorial/controlflow.html#lambda-expressions https://docs.python.org/3/tutorial/controlflow.html#lambda-e... If you're telling me this isn't Pythonic, you're really just not being sensible.
  - js8 10y ago
    > Like what am I supposed to pass to sort(key)? And incidentally, this tuple unpacking problem comes up when sorting frequently... I suggest you look at namedtuple: https://docs.python.org/3/library/collections.html#collections.namedtuple https://docs.python.org/3/library/collections.html#collectio... I think you should watch some Raymond Hettinger's talks, he is discussing many little things like this.
  - rndgermandude 10y ago
    Yes, Really Now! Your disdain for the answers people are giving you, and your abrasive demeanor tell me I can spend my time better than to discuss this further with you.
js8 10y ago
Why would you want to downvote somebody trying to help you? In any case, I think I see your problem. You are not the sole user of Python language. There are features that other people like (such as using '*' in unpacking), and so features you like are weighted against their use cases, and a reasonable compromise is made. And frankly, I think if you like to use lambdas that much, you really want to program in a language where everything is an expression, such as Lisp or Haskell.
- masklinn 10y ago
  > Why would you want to downvote somebody trying to help you? Misreading comments is not helping.
  - js8 10y ago
    That's why I used the word "trying". Maybe you should read more carefully before you want to accuse others from misreading something. ;-) I think it's unfair to say that I misread his comment - he doesn't explicitly mention he is aware of the workaround I outlined for the functions, and that he is bothered with lack of tuple unpacking in lambda expressions only, not in ordinary functions. Regardless, I still think it's quite impolite to downvote somebody who wants to help you and misunderstands you, if they are not e.g. factually incorrect. If you don't actually tell me where I am wrong, I cannot improve my answer. Also, this is not Stackoverflow, where that could be marginally acceptable (I am very strongly against downvoting without explanation).
    - wfunction 10y ago
      > Regardless, I still think it's quite impolite to downvote somebody who wants to help you and misunderstands you Well, I don't consider it a "misunderstanding" when there are literally just 2 things to note in my comment that you're replying to ("lambda" and "tuple unpacking") and you still somehow miss 1 of them. I think it totally deserves a downvote, because it makes me look stupid when you present a reasonable solution to a non-problem and make readers assume I was saying something other than I was, and on top of that I have to waste some 5-10 minutes of my time replying. That's not something I appreciate. That said, like I said, I never actually downvoted that comment (because I obviously couldn't). So you don't need to worry about the internet points.

rndgermandude 10y ago

Lambdas are not really pythonic these days anyway list(map(lambda (some, thing): some + thing, everything)) # better list(some + thing for (some, thing) in everything) Or, as the parent suggests, just create helper function, preferably one your python environment doesn't need to set up every time your outer function is called # okish, "verbose lambda" def compute(everything): def magic(elem): some, thing = elem return some + thing return list(map(magic, everything)) # probably better def magic(some, thing): return some + thing def compute(everything): return list(magic(some, thing) for (some, thing) in everything)

wfunction 10y ago
> Lambdas are not really pythonic these days anyway Too much nonsense in your comment. Really now? How about you give a realistic example where syntactic sugar doesn't substitute for it? Like what am I supposed to pass to sort(key)? And incidentally, this tuple unpacking problem comes up when sorting frequently... and that's the prime example on their web page (and a realistic one at that) for where you're supposed to use lambdas: https://docs.python.org/3/tutorial/controlflow.html#lambda-expressions https://docs.python.org/3/tutorial/controlflow.html#lambda-e... If you're telling me this isn't Pythonic, you're really just not being sensible.
- js8 10y ago
  > Like what am I supposed to pass to sort(key)? And incidentally, this tuple unpacking problem comes up when sorting frequently... I suggest you look at namedtuple: https://docs.python.org/3/library/collections.html#collections.namedtuple https://docs.python.org/3/library/collections.html#collectio... I think you should watch some Raymond Hettinger's talks, he is discussing many little things like this.
- rndgermandude 10y ago
  Yes, Really Now! Your disdain for the answers people are giving you, and your abrasive demeanor tell me I can spend my time better than to discuss this further with you.

js8 10y ago

Why would you want to downvote somebody trying to help you? In any case, I think I see your problem. You are not the sole user of Python language. There are features that other people like (such as using '*' in unpacking), and so features you like are weighted against their use cases, and a reasonable compromise is made. And frankly, I think if you like to use lambdas that much, you really want to program in a language where everything is an expression, such as Lisp or Haskell.

masklinn 10y ago
> Why would you want to downvote somebody trying to help you? Misreading comments is not helping.
- js8 10y ago
  That's why I used the word "trying". Maybe you should read more carefully before you want to accuse others from misreading something. ;-) I think it's unfair to say that I misread his comment - he doesn't explicitly mention he is aware of the workaround I outlined for the functions, and that he is bothered with lack of tuple unpacking in lambda expressions only, not in ordinary functions. Regardless, I still think it's quite impolite to downvote somebody who wants to help you and misunderstands you, if they are not e.g. factually incorrect. If you don't actually tell me where I am wrong, I cannot improve my answer. Also, this is not Stackoverflow, where that could be marginally acceptable (I am very strongly against downvoting without explanation).
  - wfunction 10y ago
    > Regardless, I still think it's quite impolite to downvote somebody who wants to help you and misunderstands you Well, I don't consider it a "misunderstanding" when there are literally just 2 things to note in my comment that you're replying to ("lambda" and "tuple unpacking") and you still somehow miss 1 of them. I think it totally deserves a downvote, because it makes me look stupid when you present a reasonable solution to a non-problem and make readers assume I was saying something other than I was, and on top of that I have to waste some 5-10 minutes of my time replying. That's not something I appreciate. That said, like I said, I never actually downvoted that comment (because I obviously couldn't). So you don't need to worry about the internet points.