python - 如何在Python中获取字符串的子字符串？(How do I get a substring of a string in Python?)

Question

Is there a way to substring a string in Python, to get a new string from the third character to the end of the string?

(有没有一种方法可以在Python中为字符串加上字符串，以从第三个字符到字符串的末尾获取新的字符串？)

Maybe like myString[2:end] ?

(也许像myString[2:end] ？)

If leaving the second part means 'till the end', and if you leave the first part, does it start from the start?

(如果离开第二部分意味着“直到最后”，而如果离开第一部分，它是否从头开始？)

  ask by Joan Venge translate from so

Answer 1

>>> x = "Hello World!"
>>> x[2:]
'llo World!'
>>> x[:2]
'He'
>>> x[:-2]
'Hello Worl'
>>> x[-2:]
'd!'
>>> x[2:-2]
'llo Worl'

Python calls this concept "slicing" and it works on more than just strings.

(Python称这个概念为“切片”，它不仅适用于字符串，还适用于更多的领域。)

Take a look here for a comprehensive introduction.

(在这里查看全面介绍。)