1.使用单引号扩起来字符串

>>> 'my python lession'       #以单引号将字符串扩起来
'my python lession'
>>> a = 'my python lession'   
>>> print(a)
my python lession

2.使用双引号将字符串扩起来

>>> "my python lession"    #使用双引号将字符串扩起来
'my python lession'
>>> a = "my python lession"
>>> print(a)
my python lession

值得说明的是，被单引号(single quote)或双引号(double quotes)包围的字符串，这两者的作用是一样的：

3.当想要输出单引号或者双引号时（将单引号，双引号作为普通字符输出），通过 \ 进行转义

>>> 'python \'escape'           
"python 'escape"
>>> a = 'python \'escape'
>>> print(a)
python 'escape     #通过\反斜线将单引号进行转移，不在乎最外层的是单引号还是双引号，反正是中间是字符串，有\就将后面的单引号，双引号进行转义
>>> 
>>> 'python \" escape'
'python " escape'
>>> a = 'python \" escape'
>>> print(a)
python " escape
>>> 
>>> "python \' escape"
"python ' escape"
>>> a = "python \' escape"
>>> print(a)
python ' escape
>>> 
>>> "python \" escape"
'python " escape'
>>> a = "python \" escape"
>>> print(a)
python " escape

4.通过单引号，双引号混合的方式输出单引号，双引号

>>> '"double quote"'    #单引号中，使用双引号，直接将双引号输出
'"double quote"'
>>> a = '"double quote"'
>>> print(a)
"double quote"
>>> 
>>> "'single quote'"     #双引号中，使用单引号，将单引号输出
"'single quote'"
>>> a = "'single quote'"
>>> print(a)
'single quote'
>>> 
>>> ""double""   #双引号中直接输出双引号报错
SyntaxError: invalid syntax
>>> "\"double\""  #双引号中直接输出双引号报错,但是将其中的双引号通过反斜线进行转义就可以了
'"double"'
>>> a = "\"double\""
>>> print(a)
"double"
>>> 
>>> ''single''  #单引号中输出单引号字符报错，加上转义字符就可以了。
SyntaxError: invalid syntax
>>> '\'single\''
"'single'"
>>> a = '\'single\''
>>> print(a)
'single'
>>> '"My python', lession'  #单引号中输出双引号可以，如有单引号，必须进行转义
SyntaxError: EOL while scanning string literal
>>> '"My python\', lession'
'"My python\', lession'
>>> a = '"My python\', lession'
>>> print(a)
"My python', lession