On 2023-09-12 16:54, Rob Cliffe via Python-ideas wrote:
On 12/09/2023 11:54, Dom Grigonis wrote:
Yes, Thank you!
So 2 solutions now. They both solve what I have encountered. Beyond that, they
differ by:
a) f-string print(f’{=a.method}’) # ‘a.method’
No new builtin needed.
Simply reprints expression representation.
I don't understand your semantics either. What would be the difference
between your proposed
print(f’{=a.method}’)
and simply writing
print('a.method')
?
Would it be just that the syntax inside the curly braces is checked for
legality,
so that
print(f'{=!?}')
would not be allowed (presumably it would cause a SyntaxError)
?
Or do you want to check that the expression can be evaluated at run time?
You could achieve that by simply writing
a.method
As for the example in your first post:
var = 710
variable_name = [k fork, v inlocals().items()ifv == 710][0]
print("Your variable name is "+ variable_name)
it does "work", but it doesn't make much sense with Python's semantics.
You could have two identifiers bound to the same object; which one you
got hold of would be essentially random.
I think the point is to have an equivalent to C#'s 'nameof'.
It would be evaluated at compile time to a string, but with the
advantage that it's clear that it's a name and not some random string
that just happens to look like a name.
For example, if you had, say:
print('The value of count is', count)
then an IDE wouldn't know that the "count" in the string literal is the
name of the variable 'count', whereas in:
print('The value of', nameof(count), 'is', count)
it's clear that you're giving the name.
An IDE would be able to rename it correctly.
This:
print('The value of', nameof(count), 'is', count)
would be compiled as:
print('The value of', 'count', 'is', count)
Tell the IDE to rename 'count' to 'my_count' and you get:
print('The value of', nameof(my_count), 'is', my_count)
which would be compiled as:
print('The value of', 'my_count', 'is', my_count)
Telling an IDE to rename when you have:
print('The value of', 'count', 'is', count)
would give you:
print('The value of', 'count', 'is', my_count)
It would miss the string literal 'count', and you'd have to fix that by
hand.
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