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              深入Python字符串-格式化【每日一個知識點第155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格式化操作。


              Python 支持格式化字符串的輸出 。盡管這樣可能會用到非常復雜的表達式,但最基本的用法是將一個值插入到一個有字符串格式符 %s 的字符串中。

              在 Python 中,字符串格式化使用與 C 中 sprintf 函數一樣的語法。

              實例(Python 3.0+)

              #!/usr/bin/python3 print (我叫 %s 今年 %d 歲! % (小明, 10))

              以上實例輸出結果:

              我叫 小明 今年 10 歲!

              python字符串格式化符號:

              <tbody</tbody

              ??? 符?? 號 描述
              ????? %c ?格式化字符及其ASCII碼
              ????? %s ?格式化字符串
              ????? %d ?格式化整數
              ????? %u ?格式化無符號整型
              ????? %o ?格式化無符號八進制數
              ????? %x ?格式化無符號十六進制數
              ????? %X ?格式化無符號十六進制數(大寫)
              ????? %f ?格式化浮點數字,可指定小數點后的精度
              ????? %e ?用科學計數法格式化浮點數
              ????? %E ?作用同%e,用科學計數法格式化浮點數
              ????? %g ?%f和%e的簡寫
              ????? %G ?%f 和 %E 的簡寫
              ????? %p ?用十六進制數格式化變量的地址

              格式化操作符輔助指令:

              符號 功能
              * 定義寬度或者小數點精度
              用做左對齊
              + 在正數前面顯示加號( + )
              <sp> 在正數前面顯示空格
              # 在八進制數前面顯示零(‘0′),在十六進制前面顯示’0x’或者’0X'(取決于用的是’x’還是’X’)
              0 顯示的數字前面填充’0’而不是默認的空格
              % ‘%%’輸出一個單一的’%’
              (var) 映射變量(字典參數)
              m.n. m 是顯示的最小總寬度,n 是小數點后的位數(如果可用的話)

              Python2.6 開始,新增了一種格式化字符串的函數?str.format(),它增強了字符串格式化的功能。


              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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