OSError with Python 3.8 (works with 3.6)

Trying to run the example code for generating the Markdown table raises OSError

from pytablewriter import MarkdownTableWriter

writer = MarkdownTableWriter()
writer.table_name = "example_table"
writer.headers = ["int", "float", "str", "bool", "mix", "time"]
writer.value_matrix = [
    [0,   0.1,      "hoge", True,   0,      "2017-01-01 03:04:05+0900"],
    [2,   "-2.23",  "foo",  False,  None,   "2017-12-23 45:01:23+0900"],
    [3,   0,        "bar",  "true",  "inf", "2017-03-03 33:44:55+0900"],
    [-10, -9.9,     "",     "FALSE", "nan", "2017-01-01 00:00:00+0900"],
]

writer.write_table()

Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/usr/lib/python3.8/concurrent/futures/process.py", line 102, in _python_exit
    thread_wakeup.wakeup()
  File "/usr/lib/python3.8/concurrent/futures/process.py", line 90, in wakeup
    self._writer.send_bytes(b"")
  File "/usr/lib/python3.8/multiprocessing/connection.py", line 183, in send_bytes
    self._check_closed()
  File "/usr/lib/python3.8/multiprocessing/connection.py", line 136, in _check_closed
    raise OSError("handle is closed")
OSError: handle is closed

As seen in the traceback, I’m running Python 3.8 with pytablewriter==0.46.1. I’ve tried versions back to 0.43.0 and it didn’t help.

The example works well with Python 3.6 and pytablewriter==0.46.1. My OS is Archlinux.

Will gladly add any more info, feel free to ask.

[thombashi]

@hugovk Thank you for confirmation.

@ivica-k I had added main guards to examples at documents and README. I assume the issue is now fixed.

Feel free to reopen if you still have problem.

[thombashi]

In pytablewriter 0.52.0 or later, no longer need to add main guard to a program if you do not increase max_worker value equals or greater than two (defaults to one).

https://github.com/thombashi/pytablewriter/releases/tag/v0.52.0