Quels sont les deux objectifs principaux de l'instruction « assert » en Python ?

Understanding the Purpose of "assert" in Python

The "assert" statement is a valuable tool in Python and other programming languages. It serves two primary purposes:

1. Early Detection of Errors:
   "assert" helps identify problems in your program at an early stage, before they escalate into complex issues. For example, it can detect a type error immediately, preventing it from propagating further.
2. Documentation and Clarity:
   Assert statements act as inline documentation, conveying to other developers that a specific condition is true and should not be broken. By asserting that a particular state is expected, you make the code more readable and self-explanatory.

To use "assert," simply follow this syntax:

assert condition

If the "condition" is true, the program continues execution. However, if the condition is false, an "AssertionError" is raised.

In Python, "assert" is similar to the following code:

if not condition:
    raise AssertionError()

Example:

>>> assert True  # No action performed
>>> assert False
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AssertionError

Optional Message:

You can include an optional message to be printed if the assertion fails:

assert False, "Oh no! This assertion failed!"

Note:

• Avoid using parentheses to call assert like a function. It is a statement, not a function.
• Assertions can be disabled by running Python in optimized mode (-O flag), where debug is set to False.

Ce qui précède est le contenu détaillé de. pour plus d'informations, suivez d'autres articles connexes sur le site Web de PHP en chinois!