在Python中，遇到异常时，一类是直接抛出异常，exception；另一类直接告警warning.
对于后者，通常是打印一句话。前者则或中断程序执行。
考虑到避免由于告警导致后续的不可预知的错误，可以对warning进行异常处理。
1. 不让打印告警信息
import warnings
warnings.filterwarnings("ignore")
2. 当异常处理，用except捕获。
import warnings
warnings.filterwarnings("error")
try:
...
except:
...
详细处理方式
| Value | Disposition |
|---|---|
| "error" | turn matching warnings into exceptions |
| "ignore" | never print matching warnings |
| "always" | always print matching warnings |
| "default" | print the first occurrence of matching warnings for each location where the warning is issued |
| "module" | print the first occurrence of matching warnings for each module where the warning is issued |
| "once" | print only the first occurrence of matching warnings, regardless of location |
如何处理