How to ignore empty columns from DB?

[Winfried]

Hello,

As I read rows from a database and concatenate some columns into a string, some columns are empty.

What is the correct way to ignore those when building the string, and avoid having "None\n"?

for row in rows:
	#How to avoid eg. "Col3 stuff\nNone\nCol 5 stuff" ?
	bigstring = f'{row["col3"]}\n{row["col4"]}\n{row["col5"]}'

Thank you.