Serhiy Storchaka <[email protected]> added the comment:
Considering the code as:
x = {
1,
2
}
It first gets constant 1.
Then gets constant 2.
Then build a set.
Then assign it to the variable.
Obviously that the variable is assigned at line 1, so you would get a backward
line in any case. The set display is multiline, it occupies lines 1 to 4. What
line should be reported? In many cases it is more convenient to take a first
line of the multiline expression. If the building a set failed (for example if
items are not hashable) you will a line "x = {" in the traceback instead of
just "}".
This is not a bug, but a feature. In future perhaps tracing and traceback will
get a range instead of a single line for multiline expressions, but it requires
significant changes in the code.
----------
nosy: +serhiy.storchaka
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<https://bugs.python.org/issue38508>
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