Help with these functions,python

Make an "empty" n by n board. Empty boards are filled with None. Assume n > 0. is_valid_location(loc, puzzle): given a location tuple (row, col) determine if those coordinates are valid locations in the puzzle. You do not need to check if value is valid. is_complete(puzzle): determine if the puzzle has any remaining None locations. You do not need to check if the puzzle is a valid solution. get_value_at_location(puzzle, loc): given a location as a tuple (row, col), return the value at that location of the given puzzle. You may assume that the location provided is a valid location. set_location(puzzle, value, loc): given a puzzle, a value, and a location (row, col), try to set the puzzle location to that value. If the puzzle location is empty, set the value and return True. If the location is already set, or the location is invalid, do not modify the puzzle and return False. You do not need to check if value is valid