https://bugs.python.org/issue15248 is about situations like the following:
>>> [(1,2,3)
(4,5,6)]
Traceback (most recent call last):
File "<pyshell#4>", line 2, in <module>
(4,5,6)]
TypeError: 'tuple' object is not callable
The original poster requested that the error message be augmented with
something like "(missing preceding comma?)"
Ezio Melotti suggested a FAQ entry like
https://docs.python.org/3/faq/programming.html#why-am-i-getting-an-unboundlocalerror-when-the-variable-has-a-value
(I think such entries below in a separate doc and will try to post on
python-ideas when I have a prototype.)
Serhiy Storchaka suggested a compiler SyntaxWarning and uploaded a
proof-of-concept diff that handled the above and many similar cases. The
diff is based on the idea that while we can only positively identify
'callables' at runtime, we *can* negatively identify many non-callables
when compiling. Ditto for subscriptables and indexables.
Serhiy concluded with
"This patch was inspired by usability improvements in GCC 8.
https://developers.redhat.com/blog/2018/03/15/gcc-8-usability-improvements/
I haven't created a pull request because I have doubts about that this
should be in the compiler rather of a third-party linter. But if several
other core developers will support this idea I'll continue working in
this direction."
I was impressed with how clear and readable the patch is and consider it
a plausible enhancement. I would like other core developers to comment.
--
Terry Jan Reedy
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