The L denotes type 'long'. The elements in the list are long integers.
If all the values are of type 'long', you can use map() function to convert to integer. Check the following example.
>>> aa=[2l,3l,4l]>>> aa[2L, 3L, 4L]>>> aa_int=map(int,aa)>>> aa_int[2, 3, 4]
>>> aa=[2l,3l,4l]
>>> aa
[2L, 3L, 4L]
>>> aa_int=map(int,aa)
>>> aa_int
[2, 3, 4]