New submission from Ned Batchelder <n...@nedbatchelder.com>:
Here is a trace involving generator expressions. Using 3.10.0b3 on Mac, there
are "line" events within the expression. Those events are missing on Windows.
--- 8< -------------------------------
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
def doit():
o = ((1,2), (3,4))
o = (a for a in o)
for tup in o:
x = tup[0]
y = tup[1]
print(sys.version)
sys.settrace(trace)
doit()
---------------------------------------
When run on Mac, it produces this output:
3.10.0b3 (default, Jun 18 2021, 06:43:38) [Clang 12.0.0 (clang-1200.0.32.29)]
call 10: def doit():
line 11: o = ((1,2), (3,4))
line 12: o = (a for a in o)
line 13: for tup in o:
call 12: o = (a for a in o)
line 12: o = (a for a in o)
retu 12: o = (a for a in o)
line 14: x = tup[0]
line 15: y = tup[1]
line 13: for tup in o:
call 12: o = (a for a in o)
line 12: o = (a for a in o)
retu 12: o = (a for a in o)
line 14: x = tup[0]
line 15: y = tup[1]
line 13: for tup in o:
call 12: o = (a for a in o)
retu 12: o = (a for a in o)
retu 13: for tup in o:
When run on Windows, it produces this output:
3.10.0b3 (tags/v3.10.0b3:865714a, Jun 17 2021, 20:39:25) [MSC v.1929 64 bit
(AMD64)]
call 10: def doit():
line 11: o = ((1,2), (3,4))
line 12: o = (a for a in o)
line 13: for tup in o:
call 12: o = (a for a in o)
retu 12: o = (a for a in o)
line 14: x = tup[0]
line 15: y = tup[1]
line 13: for tup in o:
call 12: o = (a for a in o)
retu 12: o = (a for a in o)
line 14: x = tup[0]
line 15: y = tup[1]
line 13: for tup in o:
call 12: o = (a for a in o)
retu 12: o = (a for a in o)
retu 13: for tup in o:
On Windows, the "line 12" events are missing.
----------
components: Interpreter Core
keywords: 3.10regression
messages: 396050
nosy: Mark.Shannon, nedbat
priority: normal
severity: normal
status: open
title: Generator expressions trace differently on Windows than on Mac
versions: Python 3.10
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44450>
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