Write a function is_timestamp(tstamp) that uses a regex to test if a given string evaluates to a correct 24-hour timestamp that adopts the HH:MM:SS format.

Examples:

is_timestamp('00:00:00') -> True is_timestamp('01:59:47') -> True is_timestamp('23:59:01') -> True is_timestamp('11:32:05') -> True is_timestamp('24:00:00') -> False is_timestamp('09:62:01') -> False is_timestamp('9:05:01') -> False

python jupyter