4 ms·

As someone who's bounced back and forth between Python 2 and Python 3, I'm curious about your need of parameter tuple unpacking[0]. I've never encountered it, a

As someone who's bounced back and forth between Python 2 and Python 3, I'm curious about your need of parameter tuple unpacking[0]. I've never encountered it, and after some research I don't understand the use case. I don't mean to sound like I'm trying to belittle your position, I would like to understand more. The PEP below doesn't seem to do a very good job explaining why people like them, and I'd like to hear a proponents position on the feature. [0] - https://www.python.org/dev/peps/pep-3113/ https://www.python.org/dev/peps/pep-3113/

unoti 11y ago
A good example of a use case I can think of would be to pass an (x,y) coordinate pair as a single parameter, and unpack it in the parameter definition. This would save having an extra line that says (x,y) = pt. Unless I'm missing something, I don't see this as a show stopper personally, and see it as increasing readability.
- jacobolus 11y ago
  You should use a namedtuple for that sort of thing, and then refer to the members as pt.x and pt.y.
mycelium 11y ago
I use it like es6 or haskell destructuring. Sure it's a little weak compared to both those implementations, but the tuple case covers enough to be useful.
- pyre 11y ago
  EC6 allows you to destructure in the function definition?
  - mycelium 11y ago
    Yep. It's awesome. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment#Function_argument_defaults https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...
  - emidln 11y ago
    As someone who splits his time between Python, Clojure, and Javascript (via Babel), lack of this is extremely annoying for Python since the other two languages allow it.
wfunction 11y ago
> As someone who's bounced back and forth between Python 2 and Python 3, I'm curious about your need of parameter tuple unpacking[0]. I've never encountered it, and after some research I don't understand the use case. > I don't mean to sound like I'm trying to belittle your position, I would like to understand more. The PEP below doesn't seem to do a very good job explaining why people like them, and I'd like to hear a proponents position on the feature. Basically, I need it for functional programming. See here: https://news.ycombinator.com/item?id=10213963 https://news.ycombinator.com/item?id=10213963

unoti 11y ago

A good example of a use case I can think of would be to pass an (x,y) coordinate pair as a single parameter, and unpack it in the parameter definition. This would save having an extra line that says (x,y) = pt. Unless I'm missing something, I don't see this as a show stopper personally, and see it as increasing readability.

jacobolus 11y ago
You should use a namedtuple for that sort of thing, and then refer to the members as pt.x and pt.y.

mycelium 11y ago

I use it like es6 or haskell destructuring. Sure it's a little weak compared to both those implementations, but the tuple case covers enough to be useful.

pyre 11y ago
EC6 allows you to destructure in the function definition?
- mycelium 11y ago
  Yep. It's awesome. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment#Function_argument_defaults https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...
- emidln 11y ago
  As someone who splits his time between Python, Clojure, and Javascript (via Babel), lack of this is extremely annoying for Python since the other two languages allow it.

wfunction 11y ago

> As someone who's bounced back and forth between Python 2 and Python 3, I'm curious about your need of parameter tuple unpacking[0]. I've never encountered it, and after some research I don't understand the use case. > I don't mean to sound like I'm trying to belittle your position, I would like to understand more. The PEP below doesn't seem to do a very good job explaining why people like them, and I'd like to hear a proponents position on the feature. Basically, I need it for functional programming. See here: https://news.ycombinator.com/item?id=10213963 https://news.ycombinator.com/item?id=10213963