#10869: do not visit root node twice in ast.increment_lineno().
diff --git a/Lib/ast.py b/Lib/ast.py
index 4b2063b..ba880c9 100644
--- a/Lib/ast.py
+++ b/Lib/ast.py
@@ -159,8 +159,6 @@
Increment the line number of each node in the tree starting at *node* by *n*.
This is useful to "move code" to a different location in a file.
"""
- if 'lineno' in node._attributes:
- node.lineno = getattr(node, 'lineno', 0) + n
for child in walk(node):
if 'lineno' in child._attributes:
child.lineno = getattr(child, 'lineno', 0) + n
@@ -211,9 +209,9 @@
def walk(node):
"""
- Recursively yield all child nodes of *node*, in no specified order. This is
- useful if you only want to modify nodes in place and don't care about the
- context.
+ Recursively yield all descendant nodes in the tree starting at *node*
+ (including *node* itself), in no specified order. This is useful if you
+ only want to modify nodes in place and don't care about the context.
"""
from collections import deque
todo = deque([node])
diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index 34456bc..499facd 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -264,6 +264,13 @@
'op=Add(), right=Num(n=1, lineno=4, col_offset=4), lineno=4, '
'col_offset=0))'
)
+ # issue10869: do not increment lineno of root twice
+ self.assertEqual(ast.increment_lineno(src.body, n=3), src.body)
+ self.assertEqual(ast.dump(src, include_attributes=True),
+ 'Expression(body=BinOp(left=Num(n=1, lineno=4, col_offset=0), '
+ 'op=Add(), right=Num(n=1, lineno=4, col_offset=4), lineno=4, '
+ 'col_offset=0))'
+ )
def test_iter_fields(self):
node = ast.parse('foo()', mode='eval')