Cacher is the code snippet organizer for pro developers

# made in response to
# http://blender.stackexchange.com/q/44983/935

bl_info = {
    "version": (1, 0),
    "blender": (2, 75, 0),
    "name": "testing play pause",
    "description": """testing addon""" ,
    "category": "test",
}

import bpy

class playStuff(bpy.types.Operator):
    """Play/Pause sound"""
    bl_idname = "scene.play"
    bl_label = "Play stuff"

    def execute(self, context):
        context.scene.is_playing = not context.scene.is_playing
        return {'FINISHED'}

def play_panel_draw(context, layout):
    scn = context.scene
    row = layout.row()
    row.operator("scene.play", text="", icon='PLAY' if not scn.is_playing else 'PAUSE')

class playPausePanel(bpy.types.Panel):
    bl_label = "Play/Pause"
    bl_idname = "SCENE_PT_play"
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'

    def draw(self, context):
        play_panel_draw(context, self.layout)

def register():
    bpy.types.Scene.is_playing = bpy.props.BoolProperty()
    bpy.utils.register_class(playStuff)
    bpy.utils.register_class(playPausePanel)

def unregister():
    bpy.utils.unregister_class(playPausePanel)
    bpy.utils.unregister_class(playStuff)
    del bpy.types.Scene.is_playing

if __name__ == "__main__":
    register()

#  Redistribution and use in source and binary forms, with or without
#  modification, are permitted provided that the following conditions are
#  met:
#
#  * Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#  * Redistributions in binary form must reproduce the above
#    copyright notice, this list of conditions and the following disclaimer
#    in the documentation and/or other materials provided with the
#    distribution.
#
#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
#  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
#  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
#  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
#  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
#  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
#  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
#  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
#  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
#  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#