Python: merge lists of tuples based on its values

Python: merge lists of tuples based on its values

I'm trying to figure out a method to merge two lists in python in order to
accomplish something like this:
list_a = [(item_1, attribute_x), (item_2, attribute_y), (item_3,
attribute_z)]
list_b = [(item_1, attribute_n), (item_3, attribute_p) ]
As result:
list_result = [(item_1, attribute_x, attribute_n), (item_2, attribute_y,
False), (item_3, attribute_z, attribute_p)]
Any ideas?