File upload zip?

Panel
1

Is it possible for user to upload zip file and save it?

2

Yes, with the FileInput widget.

3

getting error when trying to save the upload zip to disk.

import panel as pn

file_input = pn.widgets.FileInput(accept=’.zip’)

if file_input.value is not None:

file_input.save(r'C:\Users\username\Downloads\test.zip')

app = pn.Row(file_input.controls(jslink=True), file_input)

app.show()

4

TypeError: Object of type bytes is not JSON serializable
ERROR:tornado.application:Exception in callback functools.partial(<bound method IOLoop._discard_future_result of <tornado.platform.asyncio.AsyncIOMainLoop object at 0x0000011FDACA4088>>, <Task finished coro=<_needs_document_lock.._needs_document_lock_wrapper() done, defined at C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\site-packages\bokeh\server\session.py:77> exception=TypeError(‘Object of type bytes is not JSON serializable’)>)
Traceback (most recent call last):
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\site-packages\tornado\ioloop.py”, line 741, in _run_callback
ret = callback()
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\site-packages\tornado\ioloop.py”, line 765, in _discard_future_result
future.result()
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\site-packages\bokeh\server\session.py”, line 97, in _needs_document_lock_wrapper
result = await result
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\site-packages\panel\reactive.py”, line 356, in _change_coroutine
self._change_event(doc)
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\site-packages\panel\reactive.py”, line 370, in _change_event
self._process_events(events)
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\site-packages\panel\reactive.py”, line 315, in process_events
self.param.update(**self_events)
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\site-packages\param\parameterized.py”, line 1898, in update
self._batch_call_watchers()
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\site-packages\param\parameterized.py”, line 2059, in batch_call_watchers
self._execute_watcher(watcher, events)
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\site-packages\param\parameterized.py”, line 2021, in execute_watcher
watcher.fn(*args, **kwargs)
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\site-packages\panel\param.py”, line 559, in link
widget.param.update(**updates)
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\site-packages\param\parameterized.py”, line 1898, in update
self._batch_call_watchers()
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\site-packages\param\parameterized.py”, line 2059, in batch_call_watchers
self._execute_watcher(watcher, events)
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\site-packages\param\parameterized.py”, line 2021, in _execute_watcher
watcher.fn(*args, **kwargs)
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\site-packages\panel\reactive.py”, line 294, in _param_change
msg = self._process_param_change({event.name: event.new})
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\site-packages\panel\widgets\input.py”, line 701, in process_param_change
value = json.dumps(value)
File "C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\json_init.py", line 231, in dumps
return _default_encoder.encode(obj)
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\json\encoder.py”, line 199, in encode
chunks = self.iterencode(o, _one_shot=True)
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\json\encoder.py”, line 257, in iterencode
return _iterencode(o, 0)
File “C:\Users\agriffin\AppData\Local\ESRI\conda\envs\arcgispro-py3-pyviz\lib\json\encoder.py”, line 179, in default
raise TypeError(f’Object of type {o.class.name} ’
TypeError: Object of type bytes is not JSON serializable

5

Hi @Andre

The error message is caused by adding the file_input.controls(jslink=True). The file_input.controls cannot display a byte object (the file) because its not json serializable. Feel free to file a bug report.

But the below works

import panel as pn

file_input = pn.widgets.FileInput(accept=".zip")

@pn.depends(file_input, watch=True)
def save(value):
    if file_input.value is not None:
        file_input.save('test.zip')
        print("saved")
    else:
        print("nothing to save")

pn.Column(file_input).servable()
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