On 5/11/18 5:12 PM, Angus Hollands wrote:
*Readability:*
A smaller point is that I don't feel that ":=" is very readable. If we
had to use an operator, I think $= is better, but me reasoning for this
is weak. I think it derives from my observation that ":=" is slow to
distinguish from "=".
:= would prevent you from using assignment expressions inside f-strings,
which could be argued is a good thing.
To demonstrate, and just for giggles, this works in 3.6, and appears to
have the desired behavior:
--------------------------
class X:
def __init__(self, value):
self.value = value
def __str__(self):
return str(self.value)
def __format__(self, fmt):
assert fmt[0] == '='
self.value = eval(fmt[1:])
return ''
x = X(3)
print(x)
f'{x:=4}' # Behold!
print(x)
--------------------------
Produces:
3
4
I kid, of course.
Eric
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