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              Python數字函數【每日一個知識點第136期-Python】

              NumberPython的一種基本數據類型,用于存儲數值。作為編程語言的基礎之一,其重要性毋庸置疑,我們之前也曾經帶大家了解過關于number的一些知識。從今天開始,我們將帶領大家深入了解數字運算。


              函數 返回值 ( 描述 )
              abs(x) 返回數字的絕對值,如abs(-10) 返回 10
              ceil(x) 返回數字的上入整數,如math.ceil(4.1) 返回 5
              cmp(x, y) 如果 x < y 返回 -1, 如果 x == y 返回 0, 如果 x > y 返回 1。?Python 3 已廢棄?。使用?使用 (x>y)-(x<y)?替換。
              exp(x) 返回e的x次冪(ex),如math.exp(1) 返回2.718281828459045
              fabs(x) 返回數字的絕對值,如math.fabs(-10) 返回10.0
              floor(x) 返回數字的下舍整數,如math.floor(4.9)返回 4
              log(x) 如math.log(math.e)返回1.0,math.log(100,10)返回2.0
              log10(x) 返回以10為基數的x的對數,如math.log10(100)返回 2.0
              max(x1, x2,…) 返回給定參數的最大值,參數可以為序列。
              min(x1, x2,…) 返回給定參數的最小值,參數可以為序列。
              modf(x) 返回x的整數部分與小數部分,兩部分的數值符號與x相同,整數部分以浮點型表示。
              pow(x, y) x**y 運算后的值。
              round(x [,n]) 返回浮點數x的四舍五入值,如給出n值,則代表舍入到小數點后的位數。
              sqrt(x) 返回數字x的平方根。

               


              隨機數函數

              隨機數可以用于數學,游戲,安全等領域中,還經常被嵌入到算法中,用以提高算法效率,并提高程序的安全性。

              Python包含以下常用隨機數函數:

              函數 描述
              choice(seq) 從序列的元素中隨機挑選一個元素,比如random.choice(range(10)),從0到9中隨機挑選一個整數。
              randrange ([start,] stop [,step]) 從指定范圍內,按指定基數遞增的集合中獲取一個隨機數,基數缺省值為1
              random() 隨機生成下一個實數,它在[0,1)范圍內。
              seed([x]) 改變隨機數生成器的種子seed。如果你不了解其原理,你不必特別去設定seed,Python會幫你選擇seed。
              shuffle(lst) 將序列的所有元素隨機排序
              uniform(x, y) 隨機生成下一個實數,它在[x,y]范圍內。

               


              三角函數

              Python包括以下三角函數:

              函數 描述
              acos(x) 返回x的反余弦弧度值。
              asin(x) 返回x的反正弦弧度值。
              atan(x) 返回x的反正切弧度值。
              atan2(y, x) 返回給定的 X 及 Y 坐標值的反正切值。
              cos(x) 返回x的弧度的余弦值。
              hypot(x, y) 返回歐幾里德范數 sqrt(x*x + y*y)。
              sin(x) 返回的x弧度的正弦值。
              tan(x) 返回x弧度的正切值。
              degrees(x) 將弧度轉換為角度,如degrees(math.pi/2) , 返回90.0
              radians(x) 將角度轉換為弧度

               


              數學常量

              常量 描述
              pi 數學常量 pi(圓周率,一般以π來表示)
              e 數學常量 e,e即自然常數(自然常數)。

              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。

              【13萬+人學習】《Python自動化全能開發從入門到精通》python基礎教程筆記全放送

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