Horizontal scroll with ScrollView

hscroll.py

from kivy.uix.scrollview import ScrollView
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button
from kivy.base import runTouchApp

layout = GridLayout(rows=1, size_hint_x=None)
layout.bind(minimum_width=layout.setter('width'))

for i in range(30):
    btn = Button(text=str(i), size_hint_x=None, width=40)
    layout.add_widget(btn)

root = ScrollView()
root.add_widget(layout)

runTouchApp(root)