This argument pretty much kills the proposal.
On Fri, Mar 12, 2021 at 9:01 AM Rob Cliffe via Python-ideas <
[email protected]> wrote:
> To my mind there are too many differences between running code as a
> script and running it in the REPL. This would, presumably, add another
> one: the initial line would be executed without waiting to see if there
> is a dot continuation line. And it just feels wrong to have a complete
> syntactically valid line of code ... not be a complete line of code.
> You can always add outer brackets, as in other situations where lines of
> code become over-long:
>
> y = (x.rstrip("\n")
> .split(":")[0]
> .lower())
>
> -1
> Rob Cliffe
>
> On 12/03/2021 15:32, Matt Williams wrote:
> > Hi,
> >
> > It's becoming more popular in Python to have interfaces which are built
> around method chaining as a way of applying operations to data. For example
> in pandas is moving more towards a default model where methods do not
> change the object in-place but instead return an altered version (or at
> least an altered view) of it.
> >
> > The major downside to method chaining is that it ends up creating long
> lines of code which can become hard to read. The two main solutions to this
> are 1) break down the chain and give the steps their own variable names and
> 2) split it over multiple lines using `\` as a line continuation.
> >
> > e.g.:
> >
> > y = x.rstrip("\n").split(":")[0].lower()
> >
> > would become
> >
> > y = x.rstrip("\n") \
> > .split(":")[0] \
> > .lower()
> >
> > I find the continuation character visually distracting, easy to forget
> and does not allow for line-by-line commenting (causing `SyntaxError:
> unexpected character after line continuation character`):
> >
> > y = x.rstrip("\n") \
> > .split(":")[0] \ # grab the key name
> > .lower()
> >
> > My idea is to alter the syntax of Python to allow doing:
> >
> > y = x.rstrip("\n")
> > .split(":")[0]
> > .lower()
> >
> > i.e., not requiring an explicit line continuation character in the case
> where the next line starts with a period.
> >
> > I've had a search through the archives and I couldn't see this
> discussion before. Feel free to point me to it if I've missed anything.
> >
> > Cheers,
> > Matt
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