Generating a Two-Dimensional List in Python

Using two loops specified in a comprehension, you can create a two-dimensional list.

Let's create a list consisting of three lists, which in turn contain numbers from 1 to 4. To do this, we need to make another inner comprehension within the comprehension. In it, we will specify the generation of numbers using a loop and the variable j. At the same time, the outer loop with i will be placed to the right of the inner comprehension:

lst = [[j for j in range(1, 5)] for i in range(0, 3)]
print(lst)

Code execution result:

[
	[1, 2, 3, 4],
	[1, 2, 3, 4],
	[1, 2, 3, 4],
]

Using a comprehension, create the following list:

[
	[1, 2, 3, 4, 5],
	[1, 2, 3, 4, 5],
	[1, 2, 3, 4, 5],
]

Using a comprehension, create the following list:

[
	[
		[1, 2, 3],
		[1, 2, 3],
		[1, 2, 3],
	],
	[
		[1, 2, 3],
		[1, 2, 3],
		[1, 2, 3],
	],
	[
		[1, 2, 3],
		[1, 2, 3],
		[1, 2, 3],
	],
]