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52 lines
952 B
Markdown
52 lines
952 B
Markdown
# 警告
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出现了一些需要让用户知道的问题，但又不想停止程序，这时候我们可以使用警告：
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首先导入警告模块：
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In [1]:
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```py
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import warnings
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```
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在需要的地方，我们使用 `warnings` 中的 `warn` 函数：
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```py
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warn(msg, WarningType = UserWarning)
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```
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In [2]:
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```py
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def month_warning(m):
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if not 1<= m <= 12:
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msg = "month (%d) is not between 1 and 12" % m
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warnings.warn(msg, RuntimeWarning)
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month_warning(13)
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```
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```py
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c:\Anaconda\lib\site-packages\IPython\kernel\__main__.py:4: RuntimeWarning: month (13) is not between 1 and 12
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```
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有时候我们想要忽略特定类型的警告，可以使用 `warnings` 的 `filterwarnings` 函数：
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```py
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filterwarnings(action, category)
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```
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将 `action` 设置为 `'ignore'` 便可以忽略特定类型的警告：
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In [3]:
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```py
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warnings.filterwarnings(action = 'ignore', category = RuntimeWarning)
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month_warning(13)
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``` |