[docs] [issue15248] Better explain "TypeError: 'tuple' object is not callable"

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

IDLE's Shell has treated SyntaxWarnings as errors since 2001.  I don't know if any other IDE's do the same.  Raymond's example did not concern me, as I think not calling known non-callables is preferable.

But not executing literal-with-is code, such as "a = 1; a is 1" and "0 is ''" is wrong.  See msg349431 of #34857 for more discussion of these cases.

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<https://bugs.python.org/issue15248>
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