New submission from Ned Batchelder <n...@nedbatchelder.com>:
Sometime after 3.11.0a3, tracing of decorators changed so that each decorator
line is revisited as the decorator is invoked. Is this intentional?
---< dectrace.py >-----------------------------------
import linecache, sys
def trace(frame, event, arg):
# The weird globals here is to avoid a NameError on shutdown...
if frame.f_code.co_filename == globals().get("__file__"):
lineno = frame.f_lineno
print("{} {}: {}".format(event[:4], lineno, linecache.getline(__file__,
lineno).rstrip()))
return trace
print(sys.version)
sys.settrace(trace)
def decorator(func):
return func
def doit():
@decorator
@decorator
@decorator
def func(x):
return x + 1
print(func(1))
doit()
-----------------------------------------------------
Running it on 3.10, 3.11.0a3, and latest 3.11. The last run has the new line
hightlighted with <<<<<:
$ python3.10 dectrace.py
3.10.1 (main, Dec 14 2021, 08:30:13) [Clang 12.0.0 (clang-1200.0.32.29)]
call 16: def doit():
line 17: @decorator
line 18: @decorator
line 19: @decorator
line 20: def func(x):
call 13: def decorator(func):
line 14: return func
retu 14: return func
call 13: def decorator(func):
line 14: return func
retu 14: return func
call 13: def decorator(func):
line 14: return func
retu 14: return func
line 23: print(func(1))
call 17: @decorator
line 21: return x + 1
retu 21: return x + 1
2
retu 23: print(func(1))
$ python3.11 dectrace.py
3.11.0a3 (main, Dec 9 2021, 12:22:18) [Clang 12.0.0 (clang-1200.0.32.29)]
call 16: def doit():
line 17: @decorator
line 18: @decorator
line 19: @decorator
line 20: def func(x):
call 13: def decorator(func):
line 14: return func
retu 14: return func
call 13: def decorator(func):
line 14: return func
retu 14: return func
call 13: def decorator(func):
line 14: return func
retu 14: return func
line 23: print(func(1))
call 17: @decorator
line 21: return x + 1
retu 21: return x + 1
2
retu 23: print(func(1))
$ /usr/local/cpython/bin/python3.11 dectrace.py
3.11.0a3+ (heads/main:a82baed0e9, Jan 2 2022, 08:12:01) [Clang 12.0.0
(clang-1200.0.32.29)]
call 16: def doit():
line 17: @decorator
line 18: @decorator
line 19: @decorator
line 20: def func(x):
line 19: @decorator <<<<<
call 13: def decorator(func):
line 14: return func
retu 14: return func
line 18: @decorator <<<<<
call 13: def decorator(func):
line 14: return func
retu 14: return func
line 17: @decorator <<<<<
call 13: def decorator(func):
line 14: return func
retu 14: return func
line 20: def func(x):
line 23: print(func(1))
call 17: @decorator
line 21: return x + 1
retu 21: return x + 1
2
retu 23: print(func(1))
(this might or might not be related to https://bugs.python.org/issue37971)
----------
components: Interpreter Core
keywords: 3.11regression
messages: 409539
nosy: Mark.Shannon, nedbat
priority: normal
severity: normal
status: open
title: 3.11: Tracing of decorators now visits the decorator line before the
decorator function
type: behavior
versions: Python 3.11
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46234>
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