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+---
+title: Assert in Python
+tags:
+  - python
+  - coding-language
+date: 2024-03-10
+---
+在 **Python** 中，`assert` 是一个用于判断表达式的关键字。当表达式条件为 **false** 时，它会触发异常。使用 `assert` 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。
+
+`assert` 的语法格式如下：
+
+```python
+assert expression
+```
+
+等价于：
+
+```python
+if not expression:
+    raise AssertionError
+```
+
+你也可以在 `assert` 后面紧跟参数：
+
+```python
+assert expression, '错误信息'
+```
+
+等价于：
+
+```python
+if not expression:
+    raise AssertionError('错误信息')
+```
+
+# Example
+
+
+```python
+import sys
+assert ('linux' in sys.platform), "该代码只能在 Linux 下执行"
+```
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