python那点事儿

对于数组list [ ] 和元祖 tuple ( ) 截取

l = [1,2,3,4]

t = (5,6,7,8)

print l[1:2]   # 2 

print l[1:]     # 2,3,4

print l[:2]     # 1,2

print l[-1:]    # 3

print l[:-2]    # 1,2

print l[::2]   # 3

请问看懂没？？？