Python string Slicing

This article mainly introduces the information about the string slicing operation in Python. For more information, see I. number of characters in the string

Print "Hello" [0] indicates the first character in the output string
Print "Hello" [-1] indicates the last character in the output string

Ii. string segmentation

Print "Hello" [1: 3]

# The first parameter indicates the following table in the original string
# The second description indicates the subscript of the first character of the remaining string after segmentation in the original string

This sentence is a bit wordy. Let's look at the output result directly:

El

Iii. Special situations

(1) print "Hello" [: 3] starting from the first character

(2) print "Hello" [0:] is truncated starting from the first character until the last character.

(3) print "Hello" [:] Same principle (2)

View output results:

El
Hello
Hello

4. Step Size Truncation

Print "Hello" [: 2]

Print "Hello" [:-2]

It indicates that the string is truncated from the first character, and the interval is 2 characters.

Output result:

Hlo

OlH

Python slice strings

Slice string

The string 'xxx' and the Unicode string u'xxx' can also be considered as a list. Each element is a character. Therefore, the string can also be sliced, but the operation result is still a string:

>>> 'Abcdef' [: 3]
'Abc'
>>> 'Abcdef' [-3:]
'Efg'
>>> 'Abcdef' [: 2]
'Aceg'

In many programming languages, many types of truncation functions are provided for strings. The purpose is to slice strings. Python does not have a function to intercept strings. You only need to slice an operation to complete the process, which is very simple.