File "C:\WinPython-64bit-3.6.3.0Qt5\python-3.6.3.amd64\lib\site-packages\docx\
table.py", line 288, in vertical_alignment
tcPr.vAlign_val = value
File "C:\WinPython-64bit-3.6.3.0Qt5\python-3.6.3.amd64\lib\site-packages\docx\oxml\
table.py", line 762, in vAlign_val
self.get_or_add_vAlign().val = value
AttributeError: 'lxml.etree._Element' object has no attribute 'val'