(optional - drag & drop zipped .blend file here)
i just downloaded and extracted armory and tryed to enable it in addons and got same bug , so cant use it still like 0.1 version...

I’m with lubos on this and saying there’s prolly a conflict with addons somewhere. So far, it seems your the only one running into this issue. Do you have multiple 2.79 versions? Two things I’d would try and not sure if they would solve it or not.
1: Make a “config” folder within your Armory “2.79” folder.
2: Disable every addon and try enabling just Armory.
Edit:
After some browsing and testing a put a little something together to disable all addons. There might be a better way ,but this seems to work. Run this from text editor, then try enabling Armory.
import bpy
prefs = bpy.context.user_preferences
for enabled_addons in prefs.addons.keys():
bpy.ops.wm.addon_disable(module=enabled_addons)
thanks very much that script solved the problem !!! : )
found out other solution and here is what i did:
found out if deleting addons in C:\Usersazuma\AppData\Roaming\Blender Foundation\Blender\2.79\scriptsaddons then armory started working
so i went to C:\Users\"yourusernamename"\AppData\Roaming\Blender Foundation\Blender\2.79\scriptsaddons and started delete addons that i have installed. after each 1 deleted addon i restarted Armory unil i saw the button "Play in Viewport" in 3D view
the addon that did conflict was : Code Autocomplete
version 2.0.0
later i reinstalled it and armory worked still.
Glad you figured out what addon was causing the conflict. Maybe Lubos can look at that addon and figure out why it was doing this. It’s weird that another addon would do this.
Happy the solution was found, bookmarking this as a reference when it pops up again..
Most helpful comment
thanks very much that script solved the problem !!! : )
found out other solution and here is what i did:
found out if deleting addons in C:\Usersazuma\AppData\Roaming\Blender Foundation\Blender\2.79\scriptsaddons then armory started working
so i went to C:\Users\"yourusernamename"\AppData\Roaming\Blender Foundation\Blender\2.79\scriptsaddons and started delete addons that i have installed. after each 1 deleted addon i restarted Armory unil i saw the button "Play in Viewport" in 3D view
the addon that did conflict was : Code Autocomplete
version 2.0.0
later i reinstalled it and armory worked still.