python none

Python None關(guān)鍵字 (Python None keyword)

Note: None is not a keyword – we are just considering & writing it as a keyword which is a replacement of null (in C/C++).

注意： None不是關(guān)鍵字–我們只是考慮并將其編寫為關(guān)鍵字，以替換null(在C / C ++中)。

"None" (case-sensitive) is an object of its own datatype, the NoneType, which is similar to null, it is used to define a null value to the variable or represents that a variable does not have any value at all.

“ None” (區(qū)分大小寫)是其自己的數(shù)據(jù)類型對象， NoneType ，它類似于null，用于為變量定義一個(gè)null值或表示一個(gè)變量根本沒有任何值。

None is a type of <class 'NoneType'>.

<class'NoneType'>的類型是None 。

Syntax:

句法：

None

Example:

例：

Input:a = Noneprint("a: ", a);Output:a: None

Python code to demonstrate example of None keyword

Python代碼演示None關(guān)鍵字示例

# python code to demonstrate example of # None keyword# type of None print("type of None: ", type(None))# declaring a variable and initialize it with None a = None # printing value print("a: ", a)# checkng None in condition if a == None:print("variable \'a\' contains None") else:print("variable \'a\' does not contain None")# assigning a value and rechecking the condition a = 100 if a == None:print("variable \'a\' contains None") else:print("variable \'a\' does not contain None")

Output

輸出量

type of None: <class 'NoneType'> a: None variable 'a' contains None variable 'a' does not contain None

翻譯自: https://www.includehelp.com/python/none-keyword-with-example.aspx

python none

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