warnings.filterwarnings("error", category=UserWarning)

你的问题是关于如何使用 `warnings.filterwarnings` 来将 `UserWarning` 错误类别设置为错误而不是警告。下面是一个示例代码，演示了如何实现这一点：

import warnings

warnings.filterwarnings("error", category=UserWarning)

# 触发 UserWarning 错误
warnings.warn("这是一个 UserWarning 错误")

# 这里的代码将不会执行，因为 UserWarning 被设置为错误
print("这行代码将不会被执行")

在上述代码中，通过 `warnings.filterwarnings` 将 `UserWarning` 错误类别设置为错误。当发出带有 `warnings.warn` 的 `UserWarning` 时，它将被视为错误并引发异常，导致后续代码不会执行。

相关问题

warnings.filterwarnings("ignore", category=psycopg2.Warning)为什么报AssertionError: category must be a Warning subclass

The error "AssertionError: category must be a Warning subclass" is raised because the `category` argument passed to `warnings.filterwarnings()` is expected to be a subclass of the built-in `Warning` class.

In this specific case, `psycopg2.Warning` is not a subclass of `Warning`, which is the base class for all warning categories in Python. Instead, it's a warning category defined by the `psycopg2` library.

To fix the error, you should replace `psycopg2.Warning` with a subclass of `Warning` that you define yourself or that is provided by another library. For example:

import warnings
from my_warnings import MyCustomWarning

warnings.filterwarnings("ignore", category=MyCustomWarning)

Here, `MyCustomWarning` is a subclass of `Warning` that you define in a separate module named `my_warnings`. You can also use other built-in warning classes such as `DeprecationWarning` or `UserWarning`.