# You don't necessarily need to use the functions and classes that PyLaTeX provides. 
# You can add any arbitrary text or LaTeX code to your document as strings using the NoEscape wrapper

# Eg
doc.append(NoEscape(r'\begin{tabular}{ll}'))
doc.append(NoEscape(r'\Entry{abc}{123}\\'))
doc.append(NoEscape(r'\end{tabular}'))