bpo-39524: Fixed doc-string in ast._pad_whitespace (GH-18340)

1 files changed, 1 insertions, 1 deletions

diff --git a/Lib/ast.py b/Lib/ast.py
index 495c0d6..511f095 100644
--- a/Lib/ast.py
+++ b/Lib/ast.py
@@ -302,7 +302,7 @@ def _splitlines_no_ff(source):
 
 
 def _pad_whitespace(source):
-    """Replace all chars except '\f\t' in a line with spaces."""
+    r"""Replace all chars except '\f\t' in a line with spaces."""
     result = ''
     for c in source:
         if c in '\f\t':