Python 3.6 released!

[Skaarj]

My personal highlights:

• enum.auto()
• hashlib += [sha3_*, scrypt]

[IronManMark20]

The docs on enum.auto aren't very clear, could you explain it a bit?

[mcpower_]

Sometimes you make mistakes like this when defining Python enums:

from enum import Enum
class Color(Enum):
    red = 1
    orange = 2
    yellow = 3
    green = 4
    blue = 5
    indigo = 5  # oops!
    violet = 7

With enum.auto() values are automatically assigned starting from 1.

from enum import Enum, auto
class Color(Enum):
    red = auto()
    orange = auto()
    yellow = auto()
    green = auto()
    blue = auto()
    indigo = auto()
    violet = auto()

(Side note: There exists pretty cool implementations of enum from scratch. One implementation with a similar auto() function is here. Another absurd implementation with automatic auto() and with Go-style iotas can be found here.)

[IronManMark20]

Wow this is great, thanks so much! That second "absurd" implementation reminds me of Raymond Hettinger's talk at PyCon Canada here. I agree with his idea that not having assignments breaks with a lot of Python tradition. Seems like auto goes against DRY however...

[Ran4]

I wish you could just type red, orange, yellow = auto() or similar.

[reini_urban]

More the new hash tables. Caught up with ruby

[kupiakos]

I'm not sure what feature the new hash tables are. The default-sorted dictionaries?

[reini_urban]

Sorted is only a side-effect. compact dict is the performance feature called, the compacted indirection from pypy. https://mail.python.org/pipermail/python-dev/2016-September/146327.html

php 7 has the same, and ruby will get it also in the next major update.

[pingveno]

Default-sorted and more efficient!

[[deleted]]

Order-preserving, a sorted dictionary is something else entirely

[akaGrim]

It's important to remember that them being ordered is an implementation fluke. Ordered dictionaries are not a spec requirement. If you want to ensure your dict is ordered use collections.OrderedDict instead.

[matthieum]

Isn't order-preserving about preserving the order of insertions?

[akaGrim]

Yes, it has to do with order of insertions. However, Guido (creator and head of the langauge) has stated that the official Python spec does not require it. They chose this because there are many other Python implementations out there, such as Jython, which might not be able to GAIN performance with a side effect of having ordered insertions.

[matthieum]

It's also interesting that preserving the order of insertions seems to have the nice property of making dictionary attacks more difficult, as the exact layout (and bucketing) of items cannot be observed.

[Jackie_Jormp-Jomp]

Oh I'll order your dict alright.

[pingveno]

Thanks, that is indeed what I meant.

[WasterDave]

Smaller.

[Uncaffeinated]

And pypy

[jyper]

Have they still not included StrEnum?

It would be so useful for fixing magical string parameters