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              Python變量類型有哪些?【每日一個知識點第87期-Python】

              Python的內置變量類型是非常基礎的知識點,善用變量類型轉換在日常的工作學習中會給我們帶來非常大的幫助。相對于其他語言,Python的變量類型既有自己的特色方法,也有借鑒前輩的優秀之處。


              1、Python允許同時為多個變量賦值。例如:a = b = c = 1?

              2、Python允許多個對象指定多個變量。例如:a1, b1, c1 = 1, 2, “john”?

              3、使用del語句刪除單個或多個對象。例如:

              del a

              del b,c

              4、Python有五個標準的數據類型:

              • Numbers(數字)
              • String(字符串)
              • List(列表)
              • Tuple(元組)
              • Dictionary(字典)

                4.1 Numbers 四種不同的數值類型:

                •   int(有符號整型)
                •   long(長整型[也可以代表八進制和十六進制]),Python使用”L”來顯示長整型
                •   float(浮點型)
                •   complex(復數)?復數的實部a和虛部b都是浮點型

                4.2 String 字符串列表有取值順序:

                •   從左到右索引默認0開始的,最大范圍是字符串長度少1。例如:print str[0] # 輸出字符串中的第一個字符

                4.3 List 大多數集合類的數據結構實現,支持字符,數字,字符串甚至可以包含列表(所謂嵌套)。

                •   加號(+)是列表連接運算符,星號(*)是重復操作。例如:print list * 2 # 輸出列表兩次? ??print list +? ‘test’# 打印組合的列表??

                4.4 tuple?元組類似于List,元組是不允許更新的。而列表是允許更新的。例如:

              ? ? ? ?    tuple = ( ‘abcd’, 786 , 2.23, ‘john’, 70.2 )

                    list = [ ‘abcd’, 786 , 2.23, ‘john’, 70.2 ]

                    tuple[2] = 1000 # 元組中是非法應用

                    list[2] = 1000 # 列表中是合法應用

                 4.4?dictionary 是除列表以外python之中最靈活的內置數據結構類型。列表是有序的對象集合,字典是無序的對象集合。    

                •   字典(dictionary)是除列表以外python之中最靈活的內置數據結構類型。列表是有序的對象集合,字典是無序的對象集合。例如:

                      dict = {‘name’: ‘Jack’,’NO.’:6734, ‘grade’: ‘h1’}

                      print tinydict.keys() # 輸出所有鍵

                      print tinydict.values() # 輸出所有值

              5、數據類型的轉換,只需將數據類型作為函數名即可。例如:int(x) #將x轉換為一個整數? ? str(x) #將x轉換成字符串? ??set(s) #轉換成可變集合? ??frozenset(s) #轉換成不可變集合


              《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。

              【超全整理】《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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