Fixed #24857 -- Added "python -m django" entry point.

django/__main__.py

@@ -0,0 +1,9 @@
+"""
+Invokes django-admin when the django module is run as a script.
+
+Example: python -m django check
+"""
+from django.core import management
+
+if __name__ == "__main__":
+    management.execute_from_command_line()