New submission from Camion <camion_spam-pyb...@yahoo.com>:
Hello all,
I have been investigating a bug with a generator, which crashed, reporting that
"TypeError: 'Fraction' object is not iterable".
Then I have tried to find it with the debugger and/or to reproduce it with a
simpler program, but, I have not managed to reproduce the bug in my test
program and I have been stopped by the fact that the debugger crashes with
another error:
I have reproduced it on version 3.4.2 ans 3.6.3, BUT NOT on version 2.7.9. So I
suspect it has been introduced with version 3.
Here is how to reproduce it :
1/ Open Idle
2/ create and save this text program (or open if you already did - or don't do
anything if it's already opened X-D)
from fractions import Fraction
U=Fraction(1)
def test(x):
for i in range(1, x.denominator):
x*=x
yield i, i*x
for m, n in test(U*3/5):
print (m, n)
3/ Run/check module (F5) in Idle editors window : it works perfectly
4/ start the debugger from Idle menus
5/ activate the "source" checkbox
6/ Run/check module (F5) in Idle editors window
7/ Click 3 times on [over] to get to the "for m, n in test(U*3/5):" line
8/ Click 6 times on [step], to get to the line 116 ("for m, n in test(U*3/5):")
in the fractions.py files
9/ Click a seventh time on [step] and your program will crash with the folowing
error (here with 3.6.3)
Traceback (most recent call last):
File "/raid/ArcFolder/Mes documents/Mes Textes/Mes
programmes/Machin/Test_itérateur_et_fractions.py", line 12, in <module>
for m, n in test(U*3/5):
File "/usr/local/lib/python3.6/fractions.py", line 376, in forward
return monomorphic_operator(a, b)
File "/usr/local/lib/python3.6/fractions.py", line 419, in _mul
return Fraction(a.numerator * b.numerator, a.denominator * b.denominator)
File "/usr/local/lib/python3.6/fractions.py", line 117, in __new__
if denominator is None:
File "/usr/local/lib/python3.6/fractions.py", line 117, in __new__
if denominator is None:
File "/usr/local/lib/python3.6/bdb.py", line 48, in trace_dispatch
return self.dispatch_line(frame)
File "/usr/local/lib/python3.6/bdb.py", line 66, in dispatch_line
self.user_line(frame)
File "/usr/local/lib/python3.6/idlelib/debugger.py", line 24, in user_line
self.gui.interaction(message, frame)
AttributeError: _numerator5/ Run/check module (F5) in Idle editors window
I have observed once 3.4.2 that the same operation without activating the
source checkbox, lead to a full idle freeze, but I have not been able to
reproduce it.
----------
assignee: terry.reedy
components: IDLE
messages: 307001
nosy: Camion, terry.reedy
priority: normal
severity: normal
status: open
title: Probable bug in all python3 / idle3 debugger
type: crash
versions: Python 3.6
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32140>
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