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              Python數據類型之Dictionary?【每日一個知識點第119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:Set。


              字典(dictionary)是Python中另一個非常有用的內置數據類型。

              列表是有序的對象結合,字典是無序的對象集合。兩者之間的區別在于:字典當中的元素是通過鍵來存取的,而不是通過偏移存取。

              字典是一種映射類型,字典用”{ }”標識,它是一個無序的鍵(key) : 值(value)對集合。

              鍵(key)必須使用不可變類型。

              在同一個字典中,鍵(key)必須是唯一的。

              實例

              #!/usr/bin/python3

              dict = {}
              dict[‘one’] = “1 – 菜鳥教程”
              dict[2] = “2 – 菜鳥工具”

              tinydict = {‘name’: ‘runoob’,’code’:1, ‘site’: ‘www.runoob.com’}

              print (dict[‘one’]) # 輸出鍵為 ‘one’ 的值
              print (dict[2]) # 輸出鍵為 2 的值
              print (tinydict) # 輸出完整的字典
              print (tinydict.keys()) # 輸出所有鍵
              print (tinydict.values()) # 輸出所有值

              以上實例輸出結果:

              1 - 菜鳥教程
              2 - 菜鳥工具
              {'name': 'runoob', 'site': 'www.runoob.com', 'code': 1}
              dict_keys(['name', 'site', 'code'])
              dict_values(['runoob', 'www.runoob.com', 1])

              構造函數 dict() 可以直接從鍵值對序列中構建字典如下:

              實例

              >>>dict([(‘Runoob’, 1), (‘Google’, 2), (‘Taobao’, 3)])
              {‘Taobao’: 3, ‘Runoob’: 1, ‘Google’: 2}>>> {x: x**2 for x in (2, 4, 6)}
              {2: 4, 4: 16, 6: 36}

              >>> dict(Runoob=1, Google=2, Taobao=3)
              {‘Taobao’: 3, ‘Runoob’: 1, ‘Google’: 2}

              另外,字典類型也有一些內置的函數,例如clear()、keys()、values()等。

              注意:

              • 1、字典是一種映射類型,它的元素是鍵值對。
              • 2、字典的關鍵字必須為不可變類型,且不能重復。
              • 3、創建空字典使用?{ }

              《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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