今天在学习python的基础的内容,学习在python中如何操做字符串,在此记录下.python
主要是python中字符串的几种表达,表示方式。less
python的几种表达方式学习
1 使用单引号扩起来字符串code
>>> '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字符串
>>> "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
PS:遇到问题没人解答?须要Python学习资料?能够加点击下方连接自行获取
note.youdao.com/noteshare?id=2dce86d0c2588ae7c0a88bee34324d76string
3 当想要输出单引号或者双引号时(将单引号,双引号做为普通字符输出),经过 进行转义it
>>> 'python \'escape' "python 'escape" >>> a = 'python \'escape' >>> print(a) python 'escape #经过\反斜线将单引号进行转移,不在意最外层的是单引号仍是双引号,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 经过单引号,双引号混合的方式输出单引号,双引号io
>>> '"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,可是将其中的双引号经过反斜线进行转义就能够了 '"double"' >>> a = "\"double\"" >>> print(a) "double" >>> >>> ''single'' #单引号中输出单引号字符报错,加上转义字符就能够了。 SyntaxError: invalid syntax >>> '\'single\'' "'single'" >>> a = '\'single\'' >>> print(a) 'single' >>> '"My python', lession' #单引号中输出双引号能够,若有单引号,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
备注:在交互式解释器,输出的字符串都是经过引号扩起来的,若是输出有单引号,那么最终用双引号扩起来,若是输出字符串有双引号,用单引号扩起来,若是是单双混合,那么,用单引号扩起来,若是输出字符串没有单,双引号,用单引号扩起来。学习资料