Multipane File Browser implemented in Panel

panel_file_browser.py

import os
import panel as pn

path = os.getcwd()

def get(event):
    """When dir selected populate next pane, remove any extra panes"""
    got = event.new[0]
    if os.path.isdir(got):
        items = sorted(os.listdir(got))
        options=dict(zip(items, (os.path.join(got, item) for item in items)))
        next_pane = pn.widgets.MultiSelect(options=options, size=14)
        next_pane.param.watch(get, 'value')
        index = row.objects.index(event.obj)
        if len(row.objects) > (index + 1):   
            row[index + 1] = next_pane
        else:
            row.append(next_pane)
        last_index = index + 1
    else:
        last_index = row.objects.index(event.obj)
   
    while len(row) > last_index + 1:
        row.pop(last_index + 1)

items = sorted(os.listdir(path))
options = dict(zip(items, (os.path.join(path, item) for item in items)))
select = pn.widgets.MultiSelect(options=options, size=14)
select.param.watch(get, 'value')

row = pn.Row(select)
row.servable()

Each new dir opens in a new pane like: