Nested list to dict

Question

I am trying to create dict by nested list:

groups = [[\'Group1\', \'A\', \'B\'], [\'Group2\', \'C\', \'D\']]

L = [{y:x[0] for y in x i         


        

Answer 1

This is essentially a prettier version of Willem's:

>>> groups = [['Group1', 'A', 'B'], ['Group2', 'C', 'D']]
>>> {k:g for g,*tail in groups for k in tail}
{'B': 'Group1', 'A': 'Group1', 'C': 'Group2', 'D': 'Group2'}

But it won't work with an empty list:groups = [[],['A','B']]

>>> {k:head for head, *tail in grps for k in tail}
Traceback (most recent call last):
  File "", line 1, in 
  File "", line 1, in 
ValueError: not enough values to unpack (expected at least 1, got 0)