import math
import panel as pn
pn.extension()

range_slider = pn.widgets.RangeSlider(
    name='Range Slider', start=0, end=math.pi, value=(math.pi/4., math.pi/2.), step=0.01)

range_slider

range_slider.value

from bokeh.models.formatters import PrintfTickFormatter

str_format = pn.widgets.RangeSlider(name='Distance', format='0.0a', start=100000, end=1000000)

tick_format = pn.widgets.RangeSlider(name='Distance', format=PrintfTickFormatter(format='%.3f m'))

pn.Column(str_format, tick_format)

pn.Row(range_slider.controls(jslink=True), range_slider)