[Python-ideas] from __future__ import runtime_default_kwargs

James Lu jamtlu at gmail.com
Sun Mar 10 23:48:59 EDT 2019


from __future__ import runtime_default_kwargs

Is run, 

def a(b=1, c=b+2, d=[]):

behaves as (if the peephole optimizer didn’t exist)

def a(b=None, c=None):
    if b is None:
        b = 1
    if c is None:
        c = b + 2
    if d is None:
        d = []

i.e. the keyword expression is evaluated at runtime.

Perhaps a restriction on “literals only” can be made so people don’t abuse this.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-ideas/attachments/20190310/93eea470/attachment.html>

More information about the Python-ideas mailing list