[Tutor] Break element into list while iterating

[Alan Gauld]

On 25/12/2021 17:11, Julius Hamilton wrote:
> Hey,
>
> I would like to do some kind of list comprehension where elements meeting
> certain conditions get split on a delimiter. They don’t become lists nested
> in one element in the previous list; the new elements just get inserted
> where the old one was.


Not a LC as such but I did get this:


>>> L = ['apple', 'pear', 'grape']
>>> def splitInListAt(L,idx):
    return L[:idx] + [n for n in L[idx]] + L[idx+1:]

>>> splitInListAt(L,0)
['a', 'p', 'p', 'l', 'e', 'pear', 'grape']
>>> splitInListAt(L,1)
['apple', 'p', 'e', 'a', 'r', 'grape']
>>> splitInListAt(L,2)
['apple', 'pear', 'g', 'r', 'a', 'p', 'e']
>>>

Which is generic to any kind of sequence not just strings:

>>> L = [[1,2,3],(4,5,6),{7,8,9}]
>>> splitInListAt(L,0)
[1, 2, 3, (4, 5, 6), {8, 9, 7}]
>>> splitInListAt(L,1)
[[1, 2, 3], 4, 5, 6, {8, 9, 7}]
>>> splitInListAt(L,2)
[[1, 2, 3], (4, 5, 6), 8, 9, 7]
>>>

-- 
Alan G
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