numpy - Concatenating lists of lists with variable lenght in python

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65852580/concatenating-lists-of-lists-with-variable-lenght-in-python

Answer 1

Something like this:

Event1 = [[-.1,0.1,3],[-2,1,4,4.5,4.6,4.9]]
Event2 = [[1,2]]
Event3 = [[-1,-.1,3],[1,2]]

Event1.extend(Event2)
Event1.extend(Event3)
print(Event1)

Output:

[[-0.1, 0.1, 3], [-2, 1, 4, 4.5, 4.6, 4.9], [1, 2], [-1, -0.1, 3], [1, 2]]