python split at index

1>>> list1 = ['a','b','c','d','e','f','g','h', 'i', 'j', 'k', 'l']
2>>> print list1[:5]
3['a', 'b', 'c', 'd', 'e']
4>>> print list1[-7:]
5['f', 'g', 'h', 'i', 'j', 'k', 'l']
6# Note how you can slice either positively or negatively.
7# When you use a negative number, it means we slice from right to left.

1In [42]: s = "Hello there!"
2
3In [43]: [s[v1:v2] for v1, v2 in zip([0]+l, l+[None])]
4Out[43]: ['He', 'llo ', 'the', 're!']
5