Python字符串的截取原理，下標的位置圖示

Python字符串截取時總是有些糊塗，從官網上找到一個圖示，理解Python字符串是如何標記，的具體含義圖示如下：

 

 +---+---+---+---+---+---+
 | P | y | t | h | o | n |
 +---+---+---+---+---+---+
 0   1   2   3   4   5   6
-6  -5  -4  -3  -2  -1

 

>>> word[:2]  # character from the beginning to position 2 (excluded)
'Py'
>>> word[4:]  # characters from position 4 (included) to the end
'on'
>>> word[-2:] # characters from the second-last (included) to the end
'on'