python 列表提取

a = [1,2,3,4,5,6,7,8]

print (a[:])

print (a[:4])

print (a[:-1])

print (a[4:])

print (a[-3:])

print (a[2:5])

print (a[2:-1])

print (a[-3:-1])

print (a[::-1])

print (a[::2])

print (a[1::2])

print (a[::-2])

[1, 2, 3, 4, 5, 6, 7, 8]

[1, 2, 3, 4]

[1, 2, 3, 4, 5, 6, 7]

[5, 6, 7, 8]

[6, 7, 8]

[3, 4, 5]

[3, 4, 5, 6, 7]

[6, 7]

[8, 7, 6, 5, 4, 3, 2, 1]

[1, 3, 5, 7]

[2, 4, 6, 8]

[8, 6, 4, 2]