Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
In general case the AST does not preserve detailed information about all
syntactic elements. For example in the AST for `a + b` does not include lineno
and col_offset for "+".
>>> ast.dump(ast.parse('a + b'), include_attributes=True)
"Module(body=[Expr(value=BinOp(left=Name(id='a', ctx=Load(), lineno=1,
col_offset=0, end_lineno=1, end_col_offset=1), op=Add(), right=Name(id='b',
ctx=Load(), lineno=1, col_offset=4, end_lineno=1, end_col_offset=5), lineno=1,
col_offset=0, end_lineno=1, end_col_offset=5), lineno=1, col_offset=0,
end_lineno=1, end_col_offset=5)], type_ignores=[])"
But in most cases you can determine it from the position of the surrounded
nodes. "+" lies between the end of BinOp.left and the beginning of BinOp.right,
i.e. between columns 1 and 4 at line 1. What is left is to count the number of
whitespace character before and after "+" to determine its exact position. The
same method you can use to find the position of the "else" keyword.
It is easier in 3.8 since the AST contains now also the position of the end of
the node (end_lineno and end_col_offset).
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue21992>
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