Converting a 1D list into a 2D list with a given row length in python [duplicate]

问题

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How do you split a list into evenly sized chunks? (63 answers)

Closed 6 years ago.

Is there an easy way to convert a 1D list into a 2D list with a given row length?

Suppose I have a list like this:

myList =  [1, 2, 3, 4, 5, 6, 7, 8, 9]

I want to convert the above list into a 3 x 3 table like below:

myList = [[1,2,3],[4,5,6],[7,8,9]]

I know I can accomplish this by creating a new 2D list called myList2 and inserting the element into MyList2 using 2 nested for loops. Like MyList2[x][y] = myList[i] i++

I think there should be a better way to do it (without using external libraries or modules)

Thanks!

回答1:

Using list comprehension with slice:

>>> myList =  [1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> n = 3
>>> [myList[i:i+n] for i in range(0, len(myList), n)]
[[1, 2, 3], [4, 5, 6], [7, 8, 9]]

来源：https://stackoverflow.com/questions/27371064/converting-a-1d-list-into-a-2d-list-with-a-given-row-length-in-python