DataTable.add_row() doesn't work as expected, though add_rows() does.

This script (simple_table.py)

import sys

from textual.app import App, ComposeResult
from textual.widgets import DataTable

class TableApp(App):
    def compose(self) -> ComposeResult:
        yield DataTable()

    def on_mount(self) -> None:
        table = self.query_one(DataTable)
        table.add_columns('Col 1', 'Col 2')
        rows = (
            ('v1', 'v2'),
            ('v3', 'v4')
        )
        if len(sys.argv) > 1:
            table.add_rows(rows)
        else:
            table.add_row(rows[0])
            table.add_row(rows[1])

if __name__ == "__main__":
    app = TableApp()
    app.run()

If invoked with no parameters it shows an empty table, even though two rows have been added using add_row(). The orange cursor in the image below shows that the rows have been added - they just don’t display correctly.

However, if invoked with any argument (say foo), the add_rows() path is taken and the rows do display correctly in this case:

Using repo version of textual, Linux Mint 64-bit (Cinnamon desktop).

[vsajip]

OK, sorry for the noise. I didn’t read carefully enough 😞

[davep]

add_row takes the column values as positional parameters. So rather than like this:

row = [ 1,2,3 ]
table.add_row( row )

it would be more like this:

row = [ 1,2,3 ]
table.add_row( row[0], row[1], row[2])

or even:

row = [ 1,2,3 ]
table.add_row( *row )

Edit to add: and/or what @rodrigogiraoserrao said 'cos he got in there as I was writing this. 😉