On 3/5/2018 9:34 AM, Chris Angelico wrote:
On Tue, Mar 6, 2018 at 12:52 AM, Terry Reedy <tjre...@udel.edu> wrote:
On 3/5/2018 7:12 AM, Kirill Balunov wrote:
# 1. By passing through local variable's default values
def func_local_1(numb, _int = int, _float = float, _range = range):
You are not required to mangle the names.
def func_local_1(numb, int = int, float = float, range = range):
...
Even so, this does mess up the function's signature,
Which I why I only said that using the original names solves the syntax
highlighting issue (of marking built-ins as built-ins).
leaving your
callers wondering if they can call it with some sort of range
parameter. (Though in this particular instance, range() is only called
once, so it's pretty much useless to try to optimize it.)
In theory, the CPython bytecode compiler (don't know about other
Python implementations) could just add these as constants.
Yes, what we really want for this sort of thing are unrebindable local
constants. A simple syntax change could do it.
def func_local_1(numb; int = int, float = float, range = range):
The binding after ';' belong in the header because they should be done once.
They'd then
be bound at either compile time or function definition time (by
default the former, I think, but the latter would be more useful), and
be looked up as quickly as locals. I'm not sure how useful this would
be, though.
I believe that the occasional practice of re-binding built-in names to
locals can be shown to speed up loops run enough times.
If PEP 572 [1] were to be accepted, you could do something like this:
def func(numb):
if ((int as int), (float as float)):
res = []
for i in range(numb):
res.append(int(i) + float(i))
return res
Syntactically a bit clunky, but keeps everything inside the function,
and DOES create local variables. Not sure it's better than your other
options, but it is another option.
Code in the body should be executed everytime the function is called.
Those binding should not be as they only need to be done once.
[1] PEP 572: https://www.python.org/dev/peps/pep-0572/
--
Terry Jan Reedy
--
https://mail.python.org/mailman/listinfo/python-list
