1 files changed, 4 insertions, 0 deletions
diff --git a/Lib/shlex.py b/Lib/shlex.py
index c817274..4801a6c 100644
--- a/Lib/shlex.py
+++ b/Lib/shlex.py
@@ -304,6 +304,10 @@ class shlex:
 
 def split(s, comments=False, posix=True):
     """Split the string *s* using shell-like syntax."""
+    if s is None:
+        import warnings
+        warnings.warn("Passing None for 's' to shlex.split() is deprecated.",
+                      DeprecationWarning, stacklevel=2)
     lex = shlex(s, posix=posix)
     lex.whitespace_split = True
     if not comments: