Ten awesome things you are missing out on if you're still using Python 2

[Tim Chase]

On 2017-05-08 07:17, Steven D'Aprano wrote:
> http://www.asmeurer.com/python3-presentation/slides.html#1

Just adding my regular beef about #5, the "everything is an
iterator" in regards to the new tuple-unpacking when the wild-card
is in the last position:

  >>> a,b, *c = range(10)
  >>> a
  0
  >>> b
  1
  >>> c
  [2, 3, 4, 5, 6, 7, 8, 9]
  >>> type(c)
  <class 'list'>

I've had multiple occasions where I don't care about the rest, yet
don't want to consume them.  Take for example

  a, b, *c = itertools.count()

It would be perfectly sensible to have it result in

  >>> a
  0
  >>> b
  1
  >>> c
  count(2)
  >>> type(c)
  <class 'itertools.count'>

However, because it attempts to consume the iterator before
assigning it to `c`, the code will hang until it has completely
exhausted memory.  As it says further on in #5, "If you want a list,
just wrap the result with list."

Just a personal pet peeve here. :-)

> (The web UI is a bit ~~crap~~ minimialist. Use the left and right
> arrow keys to advance backwards and forwards among the slides.)

Additionally, classic vi keys of j/k work nicely, as do
page-up/page-down, and <space> works to advance a page at a time as
well.

-tkc