I tried to list the cells in a table row with __children__ as written at
https://mwparserfromhell.readthedocs.io/en/latest/api/mwparserfromhell.nodes.html#mwparserfromhell.nodes.Node

This is a very ugly playing code that iterates on all  table rows, then after the for loop it repeats the last row, then iterates its children.
Result: the last row is repeated on screen. So all the children of a tr is itself, not table cells.

for row in wikicode.ifilter_tags(matches=lambda tag: tag.tag.lower()=="tr"):
    print(row)
    print('__')
print('______')
print(row)
for elem in row.__children__():
    print(elem)
    print('__')