python how to unnest a nested list
# Basic syntax: unnested_list = list(chain(*nested_list)) # Where chain comes from the itertools package and is useful for # unnesting any iterables # Example usage: from itertools import chain nested_list = [[1,2], [3,4]] my_unnested_list = list(chain(*nested_list)) print(my_unnested_list) --> [1, 2, 3, 4]
nested loop in list comprehension
# 2-D List matrix = [[1, 2, 3], [4, 5], [6, 7, 8, 9]] # Nested List Comprehension to flatten a given 2-D matrix flatten_matrix = [val for sublist in matrix for val in sublist] print(flatten_matrix)
python nested list
L = [[1, 2, 3],[4, 5, 6],[7, 8, 9]] for list in L: for number in list: print(number, end=' ') # Prints 1 2 3 4 5 6 7 8 9
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