arcgis desktop - How to change text legend orientation from right to left reading with arcpy

I working on mxd with ArcMap 10.3 . The default's legend properties is- Layout - left to right reading (Marked with a red ellipse) :

when it unmarked i get this legend:

i want to know if there a way to mark the default box automatic from right to left reading option so the result will be like that (Very important is that all the legend items will be in straight line from left side):

Does anyone know of a way to do this with arcpy?

UPDATE:

I tried MrBubbles answer and the result was:

while i wanted result like that (i made it manually for the example):

The answer of MrBubbles didn't help me because it very important that all the words in the legend will be right to left configuration
How can i do it?