Python as "shell" support added

Pmodules/modulecmd.bash.in

@@ -67,6 +67,9 @@ export_env() {
 		csh | tcsh )
 			local -r fmt="setenv %s \"%s\"; "
 			;;
+		python )
+			local -r fmt="os.environ['%s'] = '%s'\n"
+			;;
 		* )
 			std::die 1 "Unsupported shell -- ${Shell}"
 			;;
@@ -2838,6 +2841,9 @@ case "$1" in
 	csh | tcsh )
 		declare Shell='csh'
 		;;
+	python )
+		declare Shell='python'
+		;;
 	* )
 		std::die 1 "${CMD}: unsupported shell -- $1"
 		;;