Python assert（断言）用于判断一个表达式，在表达式条件为 false 的时候触发异常。 断言可以在条件不满足程序运行的情况下直接返回错误，而不必等待程序运行后出现崩溃的情况，例如我们的代码只能在 Linux 系统下运行，可以先判断当前系统是否符合条件。

Jan 12, 2025 · In this tutorial, you'll learn how to use Python's assert statement to document, debug, and test code in development. You'll learn how assertions might be disabled in production code, so you shouldn't use them to validate data. You'll also learn about a few common pitfalls of assertions in Python.

Feb 28, 2011 · Assert can be used/misused for various goals. It can be used to express a predicate to code. It would be faulty to assume that arg is None. It will only be triggered if a path takes the code there with arg is None.

The assert keyword is used when debugging code. The assert keyword lets you test if a condition in your code returns True, if not, the program will raise an AssertionError. You can write a message to be written if the code returns False, check the example below.

This guide will walk you through using the assert keyword to write sanity checks in Python. What Are Assertions? An assertion helps you test the validity of your program by testing whether some conditions remain true.

May 5, 2023 · In Python, the assert statement is a potent debugging tool that can assist in identifying mistakes and ensuring that your code is operating as intended. Here are several justifications for using assert:

Mar 18, 2019 · Asserts should be used to test conditions that should never happen. The purpose is to crash early in the case of a corrupt program state. Exceptions should be used for errors that can conceivably happen, and you should almost always create your own Exception classes.

May 23, 2024 · The assert statement in Python programming is a tool for establishing fundamental truths in your code. They work by empowering developers to validate assumptions within their code. In this tutorial, we will master Python's assert statement, including its syntax

Mar 15, 2025 · 文章浏览阅读542次，点赞12次，收藏4次。在 Python 代码测试中，`assert`、`unittest` 和 `pytest` 是常见的测试方法，它们的适用场景和使用方式各有不同。下面详细介绍它们的特点、使用方法，并附带示例代码。_python编程测试

Python has built-in assert statement to use assertion condition in the program. assert statement has a condition or expression which is supposed to be always true. If the condition is false assert halts the program and gives an AssertionError. In Python we can use assert statement in two ways as mentioned above.