from __future__ import print_function

from IPython.html import widgets
print(widgets.ButtonWidget.on_click.__doc__)

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

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

button.on_click(on_button_clicked)

text = widgets.TextWidget()
display(text)

def handle_submit(sender):
    print(text.value)

text.on_submit(handle_submit)

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')