[Tutor] Help!

[Alan Gauld]

On 11/09/2020 07:41, Dennis, Lauren wrote:
> how to create a two dimensional list using a for loop and range() function. 

Note that python, unlike some other languages, such as Pascal,
does not directly support multidimensional lists. Instead you
must construct a list of lists (of lists of....)

So if you know how to construct a one dimensional list you know
how to construct multi dimensional lists too. Simply create
a list of lists:

list1D = [1,2,3]
list2D = [[1,2,3],[4,5,6],[7,8,9]]

Sometimes written as:

list2D = [
           [1,2,3],
           [4,5,6],
           [7,8,9]
         ]

for clarity.

There are many ways to construct such lists, you want to
use a for loop and range. I suspect you may need two for
loops and two ranges. Here is how to construct a single
dimension list using a for/range combination:

mylist = []
for n in range(size):
    mylist.append(n)

Which can be written in abbreviated form as:

mylist = [n for n in range(size)]

Now for 2D you just have to modify that so that
instead of appending n you append another list.

-- 
Alan G
Author of the Learn to Program web site
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