python中assert

Python斷言關鍵字 (Python assert keyword)

assert is a keyword (case-sensitive) in python, it is used to debug the code. Generally, it can be used to test a condition – if a condition returns False – it returns an Assertion Error (AssertionError).

assert是python中的一個關鍵字(區分大小寫)，用于調試代碼。 通常，它可以用于測試條件-如果條件返回False-則返回斷言錯誤(AssertionError) 。

Syntax of assert keyword

assert關鍵字的語法

assert statement

Example:

例：

Input:num = 10# assert statementassert num==20Output:assert num==20AssertionError

斷言關鍵字的Python示例 (Python examples of assert keyword)

Example 1: Test a False result

示例1：測試錯誤的結果

# python code to demonstrate example of # assert statement num = 10 # number# assert statements# nothing will happed as the condition is true assert num==10#AssertionError will generate as the condition is false assert num==20

Output

輸出量

Traceback (most recent call last):File "/home/main.py", line 12, in <module>assert num==20 AssertionError

Example 2: Test a False result and return a customize message

示例2：測試錯誤結果并返回自定義消息

# python code to demonstrate example of # assert statement num = 10 # number# assert statements# nothing will happed as the condition is true assert num==10#AssertionError will generate as the condition is false assert num==20, "There is an error with num's value"

Output

輸出量

Traceback (most recent call last):File "/home/main.py", line 12, in <module>assert num==20, "There is an error with num's value" AssertionError: There is an error with num's value

翻譯自: https://www.includehelp.com/python/assert-keyword-with-example.aspx

python中assert

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