pep8 fix for kivy/uix/togglebutton.py
pep8 fixes for kivy/uix/treeview.py
pep8 fixes for kivy/uix/video.py
pep8 fixes for kivy/uix/videoplayer.py
pep8 fixes for kivy/uix/vkeyboard.py
pep8 fixes for kivy/uix/widget.py