What are Python strings? The definition of Python string and how to escape instances in detail

What is a Python string? People need a language to interact with computers. String is the most commonly used data type in Python. We can use quotation marks (' or ") to create a string. Creating a string is as simple as assigning a value to a variable.

For example:

var1 = 'Hello World!'
var2 = "www.python.cn"

Definition of Python string:

Python accesses the value in a string

Python does not support single character types, and single characters are also used as a string in Python.
When accessing substrings in Python, you can use square brackets to intercept the string, as shown in the following example:

Example:

#!/usr/bin/python
 var1 = 'Hello World!'
 var2 = "Python Runoob"
 
 print "var1[0]: ", var1[0]
 print "var2[1:5]: ", var2[1:5]

The above example execution result:

##var1[0]: Hvar2 [1:5]: ytho

##Python escape character

When special characters need to be used in characters, python uses backslash (\) to escape the characters. The following table:

转义字符	描述
\(在行尾时)	续行符
\\	反斜杠符号
\'	单引号
\"	双引号
\a	响铃
\b	退格(Backspace)
\e	转义
\000	空
\n	换行

#!/usr/bin/python
# -*- coding: UTF-8 -*-
 a = "Hello"
 b = "Python"
 
 print "a + b 输出结果：", a + b 
 print "a * 2 输出结果：", a * 2 
 print "a[1] 输出结果：", a[1] 
 print "a[1:4] 输出结果：", a[1:4] 
 if( "H" in a) :  
   print "H 在变量 a 中"
  else :    print "H 不在变量 a 中" 
 if( "M" not in a) :
   print "M 不在变量 a 中"
  else :    print "M 在变量 a 中"
 print r'\n'
 print R'\n'

以上程序执行结果为：

a + b 输出结果： HelloPython
a * 2 输出结果： HelloHello
a[1] 输出结果： e
a[1:4] 输出结果： ell
H 在变量 a 中
M 不在变量 a 中
\n
\n

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