l=['a','b','c','d',5]

>>> l[0:3]
['a', 'b', 'c']
>>> l[:3]
['a', 'b', 'c']

>>> l[-3:]
['c', 'd', 5]

>>> l[:]
['a', 'b', 'c', 'd', 5]
>>> l[0:]
['a', 'b', 'c', 'd', 5]

>>> L=list(range(100))
>>> L[0:101:10]
[0, 10, 20, 30, 40, 50, 60, 70, 80, 90]

#!/usr/bin/env python3
#-*- coding:utf-8 -*-
vlist=['a','b','c']
vtuple=('a','b','c')
vstr='abc'
print (vlist[0:2]);
print (vtuple[0:2]);
print (vstr[0:2])

======================== RESTART: C:/Python35/list.py ========================
['a', 'b']
('a', 'b')
ab