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              深入Python字符串-三引號【每日一個知識點第157期-Python】

              字符串是一種基本的數據類型,也是最常用的數據類型。掌握字符串的各種操作方式,不僅有助于我們深入了解編程語言的內部機制,也對于效率提高有不可估量的作用,今天我們就帶大家來深入了解一下字符串的三引號到底是什么。


              python三引號允許一個字符串跨多行,字符串中可以包含換行符、制表符以及其他特殊字符。實例如下

              #!/usr/bin/python3

              para_str = “””這是一個多行字符串的實例

              多行字符串可以使用制表符

              TAB ( \t )。

              也可以使用換行符 [ \n ]。

              “””

              print (para_str)

              以上實例執行結果為:

              這是一個多行字符串的實例

              多行字符串可以使用制表符

              TAB (? ? )。

              也可以使用換行符 [

              ]。

              三引號讓程序員從引號和特殊字符串的泥潭里面解脫出來,自始至終保持一小塊字符串的格式是所謂的WYSIWYG(所見即所得)格式的。

              一個典型的用例是,當你需要一塊HTML或者SQL時,這時用字符串組合,特殊字符串轉義將會非常的繁瑣。

              errHTML = ”’
              <HTML><HEAD><TITLE>
              Friends CGI Demo</TITLE></HEAD>
              <BODY><H3>ERROR</H3>
              <B>%s</B><P>
              <FORM><INPUT TYPE=button VALUE=Back
              ONCLICK=”window.history.back()”></FORM>
              </BODY></HTML>
              ”’
              cursor.execute(”’
              CREATE TABLE users (
              login VARCHAR(8),
              uid INTEGER,
              prid INTEGER)
              ”’)


              Python入門每日一個知識點》欄目是馬哥教育Python年薪20萬+的學員社群特別發起,分享Python工具、Python語法、Python項目等知識點,幫助大家快速的了解Python學習,快速步入Python高薪的快車道。

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