How to access the path where my script is located?

Coding Python Support
1

how can i access the path where my script is located.

for example when my addon is called my_addon and is in the folder blender/2.xx/my_addon.py
i want to give out the value of the path “blender/2.xx”

2

works, but only when installed over the user preferences and not opened in the texteditor. but that is ok.

i tried that before and i wondered that it gave me the path of the blend-file

3 
import bpy

i = 1
for area in bpy.context.screen.areas:
    if area.type == 'TEXT_EDITOR':
        filepath = area.spaces[0].text.filepath
        if not filepath:
            filepath = "Internal"
        print("Path %i: %s" % (i, filepath))