list_split

[nilamo]

Or, you can wrap what you return in a call to list(), which will exhaust the generator and give a list.  Or you can replace the parenthases with square brackets to use a list comprehension instead of a generator comprehension.  So the last line of your function would be either...

# wrap in list...
return list(I[i:i+n] for i in range(0, len(I), n))

# or, change to a list comprehension...
return [I[i:i+n] for i in range(0, len(I), n)]