python:assert

Python中的assert是用来检查一个条件的语句。如果条件为真，则不执行任何操作。如果条件为假，则会抛出AssertError并包含错误信息。它的语法为: assert expression [, arguments]。例如，在下面的代码中，如果x不是一个偶数，则会抛出一个错误。

x = 23
assert x%2 == 0, "x is not an even number"
输出为: AssertionError: x is not an even number

这个语句等价于:
if not expression:
raise AssertionError(arguments)

可以将assert理解为一个断言，它用于在程序执行之前或之后对结果进行断定。如果结果与预期不符，assert会抛出一个错误。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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