from __future__ import print_function # 2.7 compatability

from IPython.html import widgets # Widget definitions
from IPython.display import display # Used to display widgets in the notebook

print(widgets.Widget.on_trait_change.__doc__)

int_range = widgets.IntSliderWidget()
display(int_range)

def on_value_change(name, value):
    print(value)

int_range.on_trait_change(on_value_change, 'value')

print(widgets.ButtonWidget.on_click.__doc__)

button = widgets.ButtonWidget(description="Click Me!")
display(button)

def on_button_clicked(b):
    print("Button clicked.")

button.on_click(on_button_clicked)

def new_button(clicked):
    button = widgets.ButtonWidget()
    button.clicks = 0
    clicked.clicks += 1
    button.description = "%d" % clicked.clicks
    display(button)
    button.on_click(new_button)
button = widgets.ButtonWidget(description = "Start")
button.clicks = 0
display(button)
button.on_click(new_button)