pyshark "TypeError: sequence item 6: expected str instance, _io.TextIOWrapper found" - pyshark

Question

I am using pyshark for live packet capture. when I pass a parameter output_file = myFilObject for saving captures to a file,
getting following error on sniffing line. If output_file parameter is removed, this works absolutely fine. Please suggest.
MySampleCode:
import pyshark
def capturePacket():
outputF = open('capturepcap.pcap', 'w')
cap = pyshark.LiveCapture(interface='Ethernet 8', output_file=outputF)
cap.sniff(timeout=60)
outputF.close()
Error:
Traceback (most recent call last):
File "C:\Users\wxyz\AppData\Local\Programs\Python\Python310\lib\runpy.py", line 196, in _run_module_as_main
return _run_code(code, main_globals, None,
File "C:\Users\wxyz\AppData\Local\Programs\Python\Python310\lib\runpy.py", line 86, in _run_code
exec(code, run_globals)
File "c:\Users\wxyz\.vscode\extensions\ms-python.python-2022.6.2\pythonFiles\lib\python\debugpy\__main__.py", line 45, in <module>
cli.main()
File "c:\Users\wxyz\.vscode\extensions\ms-python.python-2022.6.2\pythonFiles\lib\python\debugpy/..\debugpy\server\cli.py", line 444, in main
run()
File "c:\Users\wxyz\.vscode\extensions\ms-python.python-2022.6.2\pythonFiles\lib\python\debugpy/..\debugpy\server\cli.py", line 285, in run_file
runpy.run_path(target_as_str, run_name=compat.force_str("__main__"))
File "C:\Users\wxyz\AppData\Local\Programs\Python\Python310\lib\runpy.py", line 269, in run_path
return _run_module_code(code, init_globals, run_name,
File "C:\Users\wxyz\AppData\Local\Programs\Python\Python310\lib\runpy.py", line 96, in _run_module_code
_run_code(code, mod_globals, init_globals,
File "C:\Users\wxyz\AppData\Local\Programs\Python\Python310\lib\runpy.py", line 86, in _run_code
exec(code, run_globals)
File "c:\Users\wxyz\Documents\automation\practice_set_script\paket_capture\basic_packetCapture.py", line 29, in <module>
capturePacket()
File "c:\Users\wxyz\Documents\automation\practice_set_script\paket_capture\basic_packetCapture.py", line 22, in capturePacket
cap.sniff(timeout=60)
File "C:\Users\wxyz\AppData\Local\Programs\Python\Python310\lib\site-packages\pyshark\capture\capture.py", line 137, in load_packets
self.apply_on_packets(keep_packet, timeout=timeout, packet_count=packet_count)
File "C:\Users\wxyz\AppData\Local\Programs\Python\Python310\lib\site-packages\pyshark\capture\capture.py", line 274, in apply_on_packets
return self.eventloop.run_until_complete(coro)
File "C:\Users\wxyz\AppData\Local\Programs\Python\Python310\lib\asyncio\base_events.py", line 641, in run_until_complete
return future.result()
File "C:\Users\wxyz\AppData\Local\Programs\Python\Python310\lib\asyncio\tasks.py", line 445, in wait_for
return fut.result()
File "C:\Users\wxyz\AppData\Local\Programs\Python\Python310\lib\site-packages\pyshark\capture\capture.py", line 283, in packets_from_tshark
tshark_process = await self._get_tshark_process(packet_count=packet_count)
File "C:\Users\wxyz\AppData\Local\Programs\Python\Python310\lib\site-packages\pyshark\capture\live_capture.py", line 94, in _get_tshark_process
tshark = await super(LiveCapture, self)._get_tshark_process(packet_count=packet_count, stdin=read)
File "C:\Users\wxyz\AppData\Local\Programs\Python\Python310\lib\site-packages\pyshark\capture\capture.py", line 399, in _get_tshark_process
self._log.debug("Creating TShark subprocess with parameters: " + " ".join(parameters))
TypeError: sequence item 6: expected str instance, _io.TextIOWrapper found
Error on reading from the event loop self pipe
loop: <ProactorEventLoop running=True closed=False debug=False>
Traceback (most recent call last):
File "C:\Users\wxyz\AppData\Local\Programs\Python\Python310\lib\asyncio\proactor_events.py", line 779, in _loop_self_reading
f = self._proactor.recv(self._ssock, 4096)
File "C:\Users\wxyz\AppData\Local\Programs\Python\Python310\lib\asyncio\windows_events.py", line 450, in recv
self._register_with_iocp(conn)
File "C:\Users\wxyz\AppData\Local\Programs\Python\Python310\lib\asyncio\windows_events.py", line 723, in _register_with_iocp
_overlapped.CreateIoCompletionPort(obj.fileno(), self._iocp, 0, 0)
OSError: [WinError 87] The parameter is incorrect
PS C:\Users\wxyz\Documents\automation\practice_set_script\paket_capture>

Answer 1

The issue in your code is these lines:
outputF = open('capturepcap.pcap', 'w')
cap = pyshark.LiveCapture(interface='Ethernet 8', output_file=outputF)
The output_file parameter is a string and not a io.TextIOWrapper
:param output_file: A string of a file to write every read packet into (useful when filtering).
So this works:
import pyshark
def capturePacket():
cap = pyshark.LiveCapture(interface='en0', output_file='capturepcap.pcap')
cap.sniff(timeout=60)
capturePacket()
Here is a reference that I put together on using PyShark