flattening lists

[Thomas Passin]

Is this what you usually do?

l1 = [[1,2,3],[4,5,6,7],[8,9]]
l2 = []
for lz in l1:
      l2.extend(lz)

print(l2)  # [1,2,3,4,5,6,7,8,9]

Not all that "tedious", perhaps... I tend to accumulate little utilities 
like this in a file and point to it with a .pth file.  Of course, you 
have to remember to include it if you share your program with someone else.

On 10/11/2022 3:32 PM, SquidBits _ wrote:
> Does anyone else think there should be a flatten () function, which just turns a multi-dimensional list into a one-dimensional list in the order it's in. e.g.
> 
> [[1,2,3],[4,5,6,7],[8,9]] becomes [1,2,3,4,5,6,7,8,9].
> 
> I have had to flatten lists quite a few times and it's quite tedious to type out. It feels like this should be something built in to python, anyone else think this way?