bpo-41887: omit leading spaces/tabs on ast.literal_eval (#22469)
Also document that eval() does this (the same way).
diff --git a/Lib/ast.py b/Lib/ast.py
index d860917..d8bd337 100644
--- a/Lib/ast.py
+++ b/Lib/ast.py
@@ -59,7 +59,7 @@
sets, booleans, and None.
"""
if isinstance(node_or_string, str):
- node_or_string = parse(node_or_string, mode='eval')
+ node_or_string = parse(node_or_string.lstrip(" \t"), mode='eval')
if isinstance(node_or_string, Expression):
node_or_string = node_or_string.body
def _raise_malformed_node(node):
diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index 5f57ce8..be4b0f7 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -1005,6 +1005,12 @@
malformed = ast.Dict(keys=[ast.Constant(1)], values=[ast.Constant(2), ast.Constant(3)])
self.assertRaises(ValueError, ast.literal_eval, malformed)
+ def test_literal_eval_trailing_ws(self):
+ self.assertEqual(ast.literal_eval(" -1"), -1)
+ self.assertEqual(ast.literal_eval("\t\t-1"), -1)
+ self.assertEqual(ast.literal_eval(" \t -1"), -1)
+ self.assertRaises(IndentationError, ast.literal_eval, "\n -1")
+
def test_bad_integer(self):
# issue13436: Bad error message with invalid numeric values
body = [ast.ImportFrom(module='time',