On Thu, 22 Dec 2022 at 03:41, Christopher Barker <pythonchb@gmail.com> wrote:
On Wed, Dec 21, 2022 at 1:18 AM Steven D'Aprano <steve@pearwood.info> wrote:
On Tue, Dec 20, 2022 at 11:55:49PM -0800, Jeremiah Paige wrote:
@property def data(self): return f"{self}"
By my testing, on Python 3.10, this is slightly faster still:
@property def data(self): return "".join((self,))
I think both of those will call self.__str__, which creates a recursion -- that's what I'm trying to avoid.
I'm sure there are ways to optimize this -- but only worth doing if it's worth doing at all :-)
Second one doesn't seem to.
class Str(str): ... def __str__(self): ... print("str!") ... return "spam" ... def __repr__(self): ... print("repr!") ... return "SPAM" ... s = Str("ham") f"{s}" str! 'spam' "".join((s,)) 'ham'
Interestingly, neither does the f-string, *if* you include a format code with lots of room. I guess str.__format__ doesn't always call __str__().
f"{s:s}" repr! SPAM f"{s:1s}" repr! SPAM f"{s:14s}" 'ham '
Curiouser and curiouser. Especially since the returned strings aren't enclosed in quotes. Let's try something.
format(s, "10s") is s False format(s, "s") is s True format(s) is s str! False
Huh. How about that. ChrisA