Issue #23811: Add missing newline to the PyCompileError error message.

Patch by Alex Shkop.

Lib/py_compile.py

@@ -178,7 +178,7 @@ def main(args=None):
             except PyCompileError as error:
                 # return value to indicate at least one failure
                 rv = 1
-                sys.stderr.write(error.msg)
+                sys.stderr.write("%s\n" % error.msg)
     return rv
 
 if __name__ == "__main__":

Misc/NEWS

@@ -29,6 +29,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #23811: Add missing newline to the PyCompileError error message.
+  Patch by Alex Shkop.
+
 - Issue #17898: Fix exception in gettext.py when parsing certain plural forms.
 
 - Issue #22982: Improve BOM handling when seeking to multiple positions of