Terry J. Reedy added the comment:
Agreed that ` is not best and should be changed. An alternative should be in
next release. I looked back at the output in msg268406.
! is similar to | but shorter, and better for that. It is also, generally,
thicker, which is better. With the font used on this page in FireFox, at my
usual size setting, |is 1.5 pixels, so it tinged red or green depending on
whether the half pixel is to the right or left. ! is 2 pixels and black, which
is better. Smaller font sizes could reverse the situation, but unlikely for me.
@ is email separator and twitter name prefix. Firefox recognizes this and
colors the first @ and all names blue. I don't like this. Not an issue in
code editors, etc, but code and especially results, get displayed elsewhere, as
here. Aside from that, it is visually too heavy and I cannot avoid reading @
as 'at'. Let's skip it.
I still like my previous 2nd choice, ^, but you apparently do not. I omitted ?
before, I think just by oversight. Let's try both with ! also, isolated from
other options.
>>> for c in "^!?":
print(".%stoplevel.%sframe.%sbutton\n" % (c, c, c))
.^toplevel.^frame.^button
.!toplevel.!frame.!button
.?toplevel.?frame.?button
? strikes me as slightly too heavy, but worse is the semantic meaning of doubt,
close to negation.
With the noise of other alternatives removed, and looking again several times,
I like ! about as much as ^, both visually and semantically. Perhaps from
knowing some Spanish, which uses inverted ! to begin sentences, I read ! as
mild affirmation. I would be equally happy with either. If you prefer !, go
with it.
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<http://bugs.python.org/issue27025>
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