Converting List of 3 Element Tuple to Dictionary

Question

If I have two List of tuples

tuple2list=[(4, 21), (5, 10), (3, 8), (6, 7)]

tuple3list=[(4, 180, 21), (5, 90, 10), (3, 270, 8), (6, 0, 7)]

Answer 1

If one wants a nested dictionary without overriding the dictionary, could use the defaultdict from the collections library.

>>> from collections import defaultdict
>>> # Edited the list a bit to show when overrides
>>> tuple3list=[(4, 180, 21), (4, 90, 10), (3, 270, 8), (6, 0, 7)]
>>> tuple3dict = defaultdict(dict)
>>> for x, y, z in tuple3list:
...     tuple3dict[x][y] = z
... 
>>> print(tuple3dict)
defaultdict(, {4: {180: 21, 90: 10}, 3: {270: 8}, 6: {0: 7}})
>>> tuple3dict[4][90]
10

Unfortunately, one line assignments are tricky or impossible, hence I assume the only valid solution would be this.