python切片功能的使用

>>> p = ['P','y','t','h','o','n']

>>> p[2:4] = ['x','y'] # Assigned list is same length as slice

>>> p

 ['P','y','x','y','o','n'] # Result is same length

>>> p = ['P','y','t','h','o','n']

>>> p[3:4] = ['x','y'] # Assigned list is longer than slice

>>> p

 ['P','y','t','x','y','o','n'] # The result is longer

>>> p = ['P','y','t','h','o','n']

>>> p[4:4] = ['x','y']

>>> p

 ['P','y','t','h','x','y','o','n'] # The result is longer still

>>> p[5:3:-1]

 ['n','o']

>>> p[100:200]

 []

>>> p[int(2e99):int(1e99)]

 []

>>> p

 ['P', 'y', 't', 'h', 'o', 'n']

>>> p[int(2e99):int(1e99)] = ['p','o','w','e','r']

>>> p

 ['P', 'y', 't', 'h', 'o', 'n', 'p', 'o', 'w', 'e', 'r']