Am 29.01.23 um 05:27 schrieb Thomas Passin:
Well, yes, we do see that. What we don't see is what you want to
accomplish by doing it, and why you don't seem willing to accept some
restrictions on the string fragments so that they will evaluate correctly.
I'll have to accept the restrictions. That's a good enough answer for
me, actually. I was just thinking that possibly there's something like
(made-up code):
x = { "foo": "bar" }
fstr = string.fstring_compile(s)
fstr.eval(x = x)
Which I didn't know about. It would make sense to me, but possibly not
enough of a usecase to make it into Python. The format() flavors do not
IOW, perhaps there is a more practical way to accomplish what you want.
Except that we don't know what that is.
Well, I don't know. I pretty much want a generic Python mechanism that
allows for exactly what f-strings do: execute arbitrary Python snippets
of code and format them in one go. In other words, I want to be able to
do things like that, given an *arbitrary* dictionary x and a string s
(which has the only restriction that its content needs to be vald
f-string grammar):
x = {
"d": 12,
"t": 12345,
"dt": datetime.datetime,
"td": datetime.timedelta
}
s = "{x['d']:09b} {'->' * (x['d'] // 3)} {(x['dt'](2000, 1, x['d']) +
x['td'](120)).strftime('%y.%m.%d')} {'<-' * (x['d'] // 4)}"
q = magic_function(s, x = x)
and have "q" then be
'000001100 ->->->-> 00.05.11 <-<-<-'
I believe the closest solution would be using a templating mechanism
(like Mako), but that has slightly different syntax and doesn't do
string formatting as nice as f-strings do. f-strings really are the
perfect syntax for what I want to do.
Cheers,
Johannes
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