import panel as pn
pn.extension()

widget = pn.widgets.TextInput(name='A widget', value='A string')
widget

widget.value

widget.value = 'ABCDEFG'

from __future__ import print_function

widget.param.watch(print, 'value')

widget.value = 'A'

slider = pn.widgets.FloatSlider(name='Another widget', width=200)
pn.Column(widget, slider, width=200)