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              Python運算符優先級規則有哪些?【每日一個知識點第103期-Python】

              在任何編程語言中,計算都是最基本的能力,一般來講,計算可以通過運算符和操作數的組合來完成。Python支持的計算類型有很多,各自也都有使用的運算符。

              在之前的知識點中我們已經了解各種類型的Python運算符,正如四則運算有其優先級規則,Python的各類運算符之間也同樣有優先級的排序。


              以下表格列出了從最高到最低優先級的所有運算符:

              運算符 描述
              ** 指數 (最高優先級)
              ~ + – 按位翻轉, 一元加號和減號 (最后兩個的方法名為 +@ 和 -@)
              * / % // 乘,除,取模和取整除
              + – 加法減法
              >> << 右移,左移運算符
              & 位 ‘AND’
              ^ | 位運算符
              <= < > >= 比較運算符
              <> == != 等于運算符
              = %= /= //= -= += *= **= 賦值運算符
              is is not 身份運算符
              in not in 成員運算符
              not or and 邏輯運算符

              以下實例演示了Python所有運算符優先級的操作:

              實例(Python 2.0+)

              #!/usr/bin/python
              # -*- coding: UTF-8 -*-

              a = 20
              b = 10
              c = 15
              d = 5
              e = 0

              e = (a + b) * c / d #( 30 * 15 ) / 5
              print “(a + b) * c / d 運算結果為:”, e

              e = ((a + b) * c) / d # (30 * 15 ) / 5
              print “((a + b) * c) / d 運算結果為:”, e

              e = (a + b) * (c / d); # (30) * (15/5)
              print “(a + b) * (c / d) 運算結果為:”, e

              e = a + (b * c) / d; # 20 + (150/5)
              print “a + (b * c) / d 運算結果為:”, e

              以上實例輸出結果:

              (a + b) * c / d 運算結果為: 90
              ((a + b) * c) / d 運算結果為: 90
              (a + b) * (c / d) 運算結果為: 90
              a + (b * c) / d 運算結果為: 50

              《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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