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              Python數據類型之number?【每日一個知識點第107期-Python】

              對于一個程序員來講,數據類型的重要性無需多言。在Python3中,有多達六種數據類型,各類型均有自己獨特的屬性和操作方式。今天我們首先帶大家來了解一下Python3的數據類型:Number。


              Python3 支持?int、float、bool、complex(復數)

              在Python 3里,只有一種整數類型 int,表示為長整型,沒有 python2 中的 Long。

              像大多數語言一樣,數值類型的賦值和計算都是很直觀的。

              內置的 type() 函數可以用來查詢變量所指的對象類型。

              >>> a, b, c, d = 20, 5.5, True, 4+3j
              >>> print(type(a), type(b), type(c), type(d))
              <class 'int'> <class 'float'> <class 'bool'> <class 'complex'>

              此外還可以用 isinstance 來判斷:

              實例

              >>>a = 111 >>> isinstance(a, int) True >>>

              isinstance 和 type 的區別在于:

              class A:
                  pass
              
              class B(A):
                  pass
              
              isinstance(A(), A)  # returns True
              type(A()) == A      # returns True
              isinstance(B(), A)    # returns True
              type(B()) == A        # returns False

              區別就是:

              • type()不會認為子類是一種父類類型。
              • isinstance()會認為子類是一種父類類型。

              注意:在 Python2 中是沒有布爾型的,它用數字 0 表示 False,用 1 表示 True。到 Python3 中,把 True 和 False 定義成關鍵字了,但它們的值還是 1 和 0,它們可以和數字相加。

              當你指定一個值時,Number 對象就會被創建:

              var1 = 1
              var2 = 10

              您也可以使用del語句刪除一些對象引用。

              del語句的語法是:

              del var1[,var2[,var3[....,varN]]]]

              您可以通過使用del語句刪除單個或多個對象。例如:

              del var
              del var_a, var_b

              數值運算

              實例

              >>>5 + 4 # 加法 9 >>> 4.32 # 減法 2.3 >>> 3 * 7 # 乘法 21 >>> 2 / 4 # 除法,得到一個浮點數 0.5 >>> 2 // 4 # 除法,得到一個整數 0 >>> 17 % 3 # 取余 2 >>> 2 ** 5 # 乘方 32

              注意:

              • 1、Python可以同時為多個變量賦值,如a, b = 1, 2。
              • 2、一個變量可以通過賦值指向不同類型的對象。
              • 3、數值的除法(/)總是返回一個浮點數,要獲取整數使用//操作符。
              • 4、在混合計算時,Python會把整型轉換成為浮點數。

              數值類型實例

              int float complex
              10 0.0 3.14j
              100 15.20 45.j
              -786 -21.9 9.322e-36j
              080 32.3e+18 .876j
              -0490 -90. -.6545+0J
              -0x260 -32.54e100 3e+26J
              0x69 70.2E-12 4.53e-7j

              Python還支持復數,復數由實數部分和虛數部分構成,可以用a + bj,或者complex(a,b)表示, 復數的實部a和虛部b都是浮點型


              《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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