Fixed the wrong argument passed - converting positional argument to named argument #129848

Author: Abhisek-Tiwari

Lib/warnings.py

@@ -422,7 +422,7 @@ def warn_explicit(message, category, filename, lineno,
     linecache.getlines(filename, module_globals)
 
     # Print message and context
-    msg = WarningMessage(message, category, filename, lineno, source)
+    msg = WarningMessage(message, category, filename, lineno,None, source) # Adding None due to positional arguments of WarningMessage()
     _showwarnmsg(msg)