say we have a dataframe with many columns.
we want a new id column, which will be a concatenation of two or more columns in the dataframe.
this is useful in a case when we have a table without a "natural" id.
for example a sales table with a client_id column, and a purchase_datetime.
this function will concat our columns:
journalctl -u airflow-webserver.service
the walrus operator, introduced in python 3.8, has been quite an useful tool.
it's documentation gives some examples of its intended use:
if (n := len(a)) > 10:
print(f"List is too long ({n} elements, expected <= 10)")before the introduction of the walrus, you'd have to do: