[New-bugs-announce] [issue4067] ast.fix_missing_locations() breaks if node doesn't have "_attributes" variable

[Marcin Bachry]

New submission from Marcin Bachry <hegel666 at gmail.com>:

ast.fix_missing_locations() fails if any node is missing "_attributes"
instance variable - but it's the case of some fundamental nodes like
"alias" or "identifier".  When I run simple test:

  import ast
  with open(__file__) as fp:
      tree = ast.parse(fp.read())
  ast.fix_missing_locations(tree)

I get:

  $ python2.6 /tmp/test.py 
  Traceback (most recent call last):
    File "/tmp/test.py", line 5, in <module>
      ast.fix_missing_locations(tree)
    File "/usr/local/lib/python2.6/ast.py", line 133, in
fix_missing_locations
      _fix(node, 1, 0)
    File "/usr/local/lib/python2.6/ast.py", line 132, in _fix
      _fix(child, lineno, col_offset)
    File "/usr/local/lib/python2.6/ast.py", line 132, in _fix
      _fix(child, lineno, col_offset)
    File "/usr/local/lib/python2.6/ast.py", line 121, in _fix
      if 'lineno' in node._attributes:
  AttributeError: 'alias' object has no attribute '_attributes'

----------
components: Library (Lib)
files: ast.diff
keywords: patch
messages: 74453
nosy: marcin.bachry
severity: normal
status: open
title: ast.fix_missing_locations() breaks if node doesn't have "_attributes" variable
type: behavior
versions: Python 2.6
Added file: http://bugs.python.org/file11730/ast.diff

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