versions will use python to mean the current version of pythonwith version number at least make sure you have the latest recommended version installed from click to execute editing by default in idle you will be working mostly with files ending in py python source files most of the time you will be editing them and running them in idleso the best default behavior when opening file with extension py is to have it open in idle if you can double click on py file in my examplesand idle opens as soon as you have installed python +great you should skip the rest of this section if idle did not openhere is how to change the default behavior in the finder go to file in my examples folder with the py extension and right click or control click on it select get info in the info window that pops upin the drop-down menu for open with:you want to see idle app on the top line (meaning it is already the defaultyou may possibly also see the version listed if you have several presumably you are going through this because you do not see idle app there you may see idle app lower down in the list of options then select it there if you did not see idle app in the drop-down list at allselect other window of apps pops up toward the bottom is check box for "always open withcheck it if you do not see python folder in the listjust below the bottom of the page change recommended applications to all applications now you should see python folder open it and select idle app the info window should become active again be sure that now under open withyou see idle app under the idle app you should see buttonchange all so that you never have to go through all these steps againbe sure to click that button confirmation window will pop up select continue now you can close the info windowand you should be able to open all py files directly in idle for editing by double clicking in the finder then if you should happen to want to directly run python file from the finder windowyou will need to select the file with control-click or right-click and select the latest python launcher for python running graphics (the graphics window likely comes up behind an unneeded console window you can close the console windowand click on the graphics window title bar to bring it to the front cgi instructions opening cgi files in idle by convention the server programs that you will be writing end in cgithat is not an extension that is automatically associated with idle for editing you will want to change the association do it the same way as the instructions above some special mac instructions