如何在numpy中获取RuntimeWarning的信息? [英] How to get the information of RuntimeWarning in numpy?

问题描述

try:
   np.arccos(10)
except RuntimeWarning:
   print('error')enter code here

但没有任何反应，我是新来的.

but nothing happens, I am a newer.

推荐答案

如果你想引起一个警告来引发一个异常，你可以使用 warnings.simplefilter("error") 这将强制警告变成异常，例如:

If you want to cause a warning to raise an exception than you can use warnings.simplefilter("error") which will force the warning into an exception, e.g.:

In []:
import warnings
warnings.simplefilter("error")
try:
    np.arccos(10)
except RuntimeWarning:
    print('error')

Out[]:
error

或者，您可以使用 warnings.catch_warnings(record=True) 上下文管理器记录警告:

Alternative, you can record the warnings with warnings.catch_warnings(record=True) context manager:

In []:
import warnings

with warnings.catch_warnings(record=True) as ws:
    np.arccos(10)
for w in ws:
    print(w.message)

Out[]:
invalid value encountered in arccos

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