Usage of get_html_string() ends up with TypeError: cannot pickle '_thread.lock' object

[ebenahar]

What did you do?

table = PrettyTable()

        table = table.get_html_string(
            attributes={
                'border': 1, 'style': 'border-width: 1px; border-collapse: collapse; text-align: center; padding: 2px;'
            }
        )

What did you expect to happen?

No exception and functionality to work

What actually happened?

Traceback (most recent call last):
  File "/home/elad/python_projects/vsphere_usage.py", line 246, in <module>
    print_rps(dc_name=dc, cluster_name=cluster)
  File "/home/elad/python_projects/vsphere_usage.py", line 214, in print_rps
    table = table.get_html_string(
  File "/home/elad/git/ocs-ci/venv/lib64/python3.9/site-packages/prettytable/prettytable.py", line 2021, in get_html_string
    string = self._get_simple_html_string(options)
  File "/home/elad/git/ocs-ci/venv/lib64/python3.9/site-packages/prettytable/prettytable.py", line 2060, in _get_simple_html_string
    rows = self._get_rows(options)
  File "/home/elad/git/ocs-ci/venv/lib64/python3.9/site-packages/prettytable/prettytable.py", line 1575, in _get_rows
    rows = copy.deepcopy(self._rows)
  File "/usr/lib64/python3.9/copy.py", line 146, in deepcopy
    y = copier(x, memo)
  File "/usr/lib64/python3.9/copy.py", line 205, in _deepcopy_list
    append(deepcopy(a, memo))
  File "/usr/lib64/python3.9/copy.py", line 146, in deepcopy
    y = copier(x, memo)
  File "/usr/lib64/python3.9/copy.py", line 205, in _deepcopy_list
    append(deepcopy(a, memo))
  File "/usr/lib64/python3.9/copy.py", line 146, in deepcopy
    y = copier(x, memo)
  File "/usr/lib64/python3.9/copy.py", line 205, in _deepcopy_list
    append(deepcopy(a, memo))
  File "/usr/lib64/python3.9/copy.py", line 172, in deepcopy
    y = _reconstruct(x, memo, *rv)
  File "/usr/lib64/python3.9/copy.py", line 270, in _reconstruct
    state = deepcopy(state, memo)
  File "/usr/lib64/python3.9/copy.py", line 146, in deepcopy
    y = copier(x, memo)
  File "/usr/lib64/python3.9/copy.py", line 230, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "/usr/lib64/python3.9/copy.py", line 172, in deepcopy
    y = _reconstruct(x, memo, *rv)
  File "/usr/lib64/python3.9/copy.py", line 270, in _reconstruct
    state = deepcopy(state, memo)
  File "/usr/lib64/python3.9/copy.py", line 146, in deepcopy
    y = copier(x, memo)
  File "/usr/lib64/python3.9/copy.py", line 230, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "/usr/lib64/python3.9/copy.py", line 161, in deepcopy
    rv = reductor(4)
TypeError: cannot pickle '_thread.lock' object

What versions are you using?

• OS: Fedora 34
• Python: 3.9.10
• PrettyTable: 3.1.1

Please include code that reproduces the issue.

The best reproductions
are
self-contained scripts
with minimal dependencies.

# code goes here

[OlafvdSpek]

Does it still fail if you run the snippet outside of vsphere_usage.py?

This works fine for me (on another OS and on another version though):

#!/usr/bin/python3
from prettytable import PrettyTable
table = PrettyTable()
table = table.get_html_string(
    attributes={
        'border': 1, 'style': 'border-width: 1px; border-collapse: collapse; text-align: center; padding: 2px;'
    }
)
print(table)