Initializer for set, like dict {} and list []

Ideas
61 
-/>>> .+\nset\(\)/
+/>>> .+\n\s+set\(\)/
2 Likes
62

Your regex is not allowing leading spaces before set.

Searching for />>> .+\n *set\(\)/ lang:python yields 1.1k results, which isnā€™t a huge number but is certainly greater than 61.

2 Likes
63

Ah that explains it[1].

1.1k is stillā€¦really low, honestly. Github code searches are not terribly informative overall, but my baseline is /print\s/ which is 6.1 million files.

  1. can you tell I donā€™t write doctests? ā†©ļøŽ

3 Likes
64

I actually didnā€™t know that you can perform a multi-line search on GitHub by including \n in a regex or I wouldā€™ve done this research myself before posting that we need to be more careful when weighing costs vs. benefits. So thanks for that!

With this research, and @effigiesā€™s rightful assessment that most doctests are meant to run against the latest Python versions, it may be safe to say that the costs of the transition are going to be reasonably low.

1 Like
65

I just found the image thatā€™s been lingering in my mind:

te
te681Ɨ234 24.8 KB

Thatā€™s why the {/} looked so familiar, yet strange at the same time. I am now neutral toward the proposal as well! We can decide its meaning in a way that suits us best.

Edit:

Fixed the hard-to-see transparent image in dark mode.

image
image333Ɨ115 6.07 KB

66

As a mathematician, {/} looks awesome :smiley:

empty_tuple = ()
empty_list  = []
empty_dict  = {}
empty_set   = {/}

Would it be added to Grammar/Tokens as a literal {/} like the Walrus Operator COLONEQUAL ':=' was, or parsed as three separate {, /, } tokens so one could write

my_empty_set = {  /  }

to add in whitespace if they wished?

5 Likes
67

For consistency with { }, I think itā€™s better to parse the tokens as separate.

Anyway my impression is that thereā€™s not so much interest in this topic, so Iā€™m doubtful it will be never added to the language.

68

It seems that there is quite good consensus on this. What would be the next step forward here? Would this need a PEP?

6 Likes
69

Yes, a PEP would need to be written for eventual submission to the Steering Council. That PEP would need a sponsor.

A

1 Like
70

Weak consensus among those who have chosen to speak up. Nothing more than that. Which is relevant becauseā€¦

ā€¦ the next step is to find a core dev who supports the proposal. Someone who would sponsor a PEP. If you canā€™t find at least one core dev whoā€™s willing to have their name on the document, it doesnā€™t have enough support to move forward with.

5 Likes