New submission from Ned Batchelder <n...@nedbatchelder.com>:
When decorating a function, the sequence of lines reported to the trace
function is different in Python3.8 than with previous versions
$ cat -n decorator.py
1 def decorator(f):
2 return f
3
4 def f():
5 @decorator
6 @decorator
7 @decorator
8 def func():
9 pass
10
11 import sys
12 def trace(frame, event, args):
13 print(frame.f_lineno, event)
14 return trace
15
16 sys.settrace(trace)
17 f()
$ python3.7 decorator.py
4 call
5 line
6 line
7 line
1 call
2 line
2 return
1 call
2 line
2 return
1 call
2 line
2 return
7 return
$ python3.8 decorator.py
4 call
5 line
6 line
7 line
5 line
1 call
2 line
2 return
1 call
2 line
2 return
1 call
2 line
2 return
5 return
Is this intentional? Will it be changed back before 3.8 ships?
People are testing their projects against 3.8-dev, and reporting problems with
coverage. The problems are due to these sorts of changes.
----------
components: Interpreter Core
messages: 326921
nosy: nedbat
priority: normal
severity: normal
status: open
title: Python3.8 changes how decorators are traced
versions: Python 3.8
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34876>
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