Filter a 3D list using python list comprehension

List comprehensions can be applied on lists of any level to filter, update, etc.
Here we will do a sample on a 3 dimensional list.
Same logic can be applied on lists of any dimension for a cleaner code.

from datetime import datetime

numlist = [
            [1, 5,
                [100, 200]
            ],
            [2, 10,
                [300, 400]
            ],
            [3, 20,
                [500, 600], 40 ,50
            ],
            [4, 30,
                [700, 800], 60, 70, 80
            ]
         ]

#Filter condition is using first level of the list
filterednumlist = [ num for num in numlist if len(num) < 3 ]
print(filterednumlist)

#Filter condition is using second level of the list
filterednumlist = [ num for num in numlist if num[0] > 3 ]
print(filterednumlist)

#Filter condition is using third level of the list
filterednumlist = [ [num[0], num[1], num[2]] for num in numlist if (num[2][0] < 300) ]
print(filterednumlist)

Outputs:

[
	[3, 20, [500, 600], 40, 50],
	[4, 30, [700, 800], 60, 70, 80]
]

[
	[1, 5, [100, 200]],
	[2, 10, [300, 400]]
]

[
	[3, 20, [500, 600]],
	[4, 30, [700, 800]]
]

To update a multi-dimensional list, refer this sample.
Update a multi-dimensional list using list comprehension