(I assume that this list is appropriate for this topic, but if it
isn't, I will be grateful for being redirected to the appropriate
place.)
It seems that warnings behave differently in Python 2 and Python
3. Consider the following script.
****************
def func():
warnings.warn("Blabla", RuntimeWarning)
warnings.simplefilter("ignore")
func()
warnings.simplefilter("always")
func()
****************
When run with CPython 2.7, there is no output, when run with
CPython 3.5, there is the following output:
****************
/tmp/test.py:4: RuntimeWarning: Blabla
warnings.warn("Blabla", RuntimeWarning)
****************
Was there indeed a change of how warnings behave in Python 3? I
searched, but couldn't find any documentation for this.
Understanding how warnings work is especially important when
testing for them.
This is how I stumbled across this, in case anyone is interested:
https://gitlab.kwant-project.org/kwant/kwant/issues/1#note_2608
I also note that the current documentation still uses
DeprecationWarning in the example of how to suppress a warning:
https://docs.python.org/dev/library/warnings.html#temporarily-suppressing-warnings.
Since DeprecationWarning is disabled by default in modern Python,
perhaps a different warning would provide a better example?
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