How can I get the value of each row from a specific column in a QTableWidget?
To get the values of all the rows of a given column then you must iterate by obtaining the QTableWidgetItems using the item() method, verify if it is valid and then get the text.
col = ...
data = []
for row in range(tablewidget.rowCount()):
it = tablewidget.item(row, col)
text = it.text() if it is not None else ""
data.append(text)
print(data)