assert <condition>,<error message> In Python we can useassertstatement in two ways as mentioned above. assertstatement has a condition and if the condition is not satisfied the program will stop and giveAssertionError. assertstatement can also have a condition and a optional error message. If ...
assert<condition>#相当于👇if__debug__:ifnotexpression:raiseAssertionError#__debug__一般为True 带提示的 assert<condition>,<error message>#相当于assertexpression1[, expression2]if__debug__:ifnotexpression1:raiseAssertionError(expression2)
Instead of using assert, we could use an if statement to check whatever condition we're trying to check, and then raise an appropriate exception with a helpful error message.Use assert for tests and for assumption checkingPython's assert statement is very handy in automated tests, and for ...
2.4 assert 语句 2.5 else 和 finally 分支 3 自定义异常对象 4 调试 4.1 使用 print() 函数 4.2 使用 pdb 模块 4.3 使用 IDE 的调试功能 参考资料:LQLab:Python 完全自学教程 — LQLab (lqpybook.readthedocs.io) 1 错误 在Python 语言中,导致程序不能运行的原因通常划分为两类:错误和异常。 错误可以分...
Python assert关键字语法 语法: assert condition, error_message(optional) 参数: condition:返回True或False的布尔值条件。 error_message:在AssertionError的情况下,在控制台中打印的可选参数。 返回:AssertionError,如果条件计算为False。 在Python中,assert关键字有助于完成此任务。此语句接受一个布尔条件作为输入,当...
If the condition in the assert statement is false, an AssertionError will be raised: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 a = [] print(avg_value(a)) AssertionError: No values The assert is pretty useful to find bugs in the code. Thus, they can be used to support testi...
An assert statement like this: assertexpression#, optional_message Is equivalent to if__debug__:ifnotexpression:raiseAssertionError#(optional_message) And, the built-in variable__debug__isTrueunder normal circumstances,Falsewhen optimization is requested (command line option-O). ...
assert condition, message 1. 其中,condition是要判断的条件,如果为假则触发断言错误;message是在断言错误时输出的错误信息。 下面是一个简单的示例,演示如何使用断言语句进行自动化断言: defdivide(a,b):assertb!=0,"除数不能为0"returna/b result=divide(10,5)print(result)# 输出 2.0result=divide(10,0)...
第python生产环境禁用assert断言的方法目录1. 背景2.解决方案2.1 禁用assert的策略2.2 禁用的原理3. 实施禁用策略3.1 启动命令行的参数中,添加O3.2 设置PYTHONOPTIMIZE环境变量4 使用断言的坑
(command line option -O). The current code generator emits no code for an assert statement when optimization is requested at compile time. Note that it is unnecessary to include the source code for the expression that failed in the error message; it will be displayed as part of the stack ...