On 21.09.15 10:18, Victor Stinner wrote:
2015-09-20 8:44 GMT+02:00 Serhiy Storchaka <storch...@gmail.com>:
I propose to make the default value of stacklevel to be 2.
I think that unlikely this will break existing code.
Consider this simple script:
---
import warnings
warnings.warn("here")
---
Currrent output:
---
x.py:3: UserWarning: here
warnings.warn("here")
---
=> it shows the script name (x.py), the line number and the line, as expected.
Now try stacklevel=2:
---
import warnings
warnings.warn("here", stacklevel=2)
---
New output:
---
sys:1: UserWarning: here
---
"sys:1" is not really useful :-/
This is not new. The same output we get when run a module that correctly
emits a warning at module level (with explicit stacklevel=2).
$ ./python -Wa Lib/imp.py
sys:1: PendingDeprecationWarning: the imp module is deprecated in favour
of importlib; see the module's documentation for alternative uses
If this message looks confusing for you, we can avoid it if stop
skipping frames further if frame.f_back is None. This will got rid of
"sys:1:" in both cases, explicit and implicit stacklevel=2.
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