It is absolutely possible that i run the sage shell twice. If i start the
shell, this is what i get:

Starting subshell with Sage environment variables set.  Don't forget
to exit when you are done.  Beware:
 * Do not do anything with other copies of Sage on your system.
 * Do not use this for installing Sage packages using "sage -i" or for
   running "make" at Sage's root directory.  These should be done
   outside the Sage shell.

Bypassing shell configuration files...

Note: SAGE_ROOT=/opt/sagemath-8.6
(sage-sh) oth@N122:~$

I want to give you everything you need but i dont know exactly what i have
to do...

Am Do., 18. Apr. 2019 um 17:47 Uhr schrieb E. Madison Bray <
erik.m.b...@gmail.com>:

> On Thursday, April 18, 2019 at 12:53:10 PM UTC+2, Oliver Thiel wrote:
>>
>> First of all, A was already defined and i realised later that i dont have
>> to define k=0 too, but, unless i am not a experienced programmer, i dont
>> think that the problem correlates with my code.
>>
>
> No, it doesn't, rest assured.
>
>
>> The company where i work uses a specific policy software and for the
>> installation of sage i get a exclusive permission.
>>
>> If i type "sage -ipython" in "SageMath 8.6 Shell":
>> NameError                                 Traceback (most recent call
>> last)
>> <ipython-input-1-ac73f397e8f1> in <module>()
>> ----> 1 sage -ipython
>>
>> NameError: name 'sage' is not defined
>>
>
> Sorry, but this is not what I asked you to do, I don't think.  The
> installer should have installed 3 icons in your start menu and/or desktop.
> The one labeled just "SageMath 8.6" directly launches the Sage command
> prompt (you get a "sage:" prompt, whereas the one labeled "SageMath 8.6
> Shell" starts a UNIX-like bash prompt (containing your username, among
> other things, and ending with "$").
>
> The command `sage -ipython` is just a problem to start (`sage`) with an
> argument flag (`-ipython`).  In this case it starts the normal IPython
> interpreter included with the Sage installation *without* loading the Sage
> library itself.  I asked you to do this in order to rule out whether the
> problem is specific to Sage, or is some deeper problem in the underlying
> software (since crashing just by typing characters into the console is
> obviously not normal).
>
> You got an exception from *Python* because you tried to enter a shell
> command (`sage -ipython`) into the *Python* interpreter prompt.  If you ran
> the "SageMath 8.6 Shell" link that should not have happened because you
> would have gotten a bash prompt instead.  Is it possible you accidentally
> ran it twice in a row?  If you ran it once it would have put you in the
> IPython prompt anyways.
>
> I wanted to see if you could run some Python code (like the loop you
> described above) in the plain IPython interpreter.  The full Sage
> interpreter just runs on IPython with some additional customizations.
>
>
>
>> After that i had to struggle with closing the shell :-D
>>
>
> Typing `exit` should work.  Could you explain more about what you
> struggled with?
>
>
>
>> There is the standart windows defender and as far as i know it makes no
>> updates right know.
>>
>> @E. Madisan Bray, what do you mean? Wich build tools? Could i update them
>> without administration rights?
>>
>
> This was a more general comment about why I haven't release Sage 8.7 for
> Windows yet.  If it doesn't mean anything to you then you can just ignore
> it.
>
>
>
>> Am Donnerstag, 18. April 2019 11:29:58 UTC+2 schrieb E. Madison Bray:
>>
>>> On Thursday, April 18, 2019 at 11:09:02 AM UTC+2, E. Madison Bray wrote:
>>>>
>>>> On Thursday, April 18, 2019 at 10:57:11 AM UTC+2, Dima Pasechnik wrote:
>>>>>
>>>>> On Thu, Apr 18, 2019 at 7:35 AM Oliver Thiel <oliver...@gmail.com>
>>>>> wrote:
>>>>> >
>>>>> > More information:
>>>>> > sage: k=0
>>>>> > ....: for k in range(1,j-1,1):
>>>>> > ....:     z=float(A[k][1])
>>>>> > ....:     s=s+z
>>>>> > ....:
>>>>> print(k)------------------------------------------------------------------------
>>>>>
>>>>> > An error occurred during signal handling.
>>>>> > This probably occurred because a *compiled* module has a bug
>>>>> > in it and is not properly wrapped with sig_on(), sig_off().
>>>>> > Python will now terminate.
>>>>> >
>>>>> ------------------------------------------------------------------------
>>>>> > this error occurs before i "enter" the command. Do not laugh about
>>>>> my simple code, i am real new to sage. :-D
>>>>> >
>>>>> I assume your A is already defined, right?
>>>>> As well, I guess this code seems to mean to compute s as a sum of
>>>>> float(A[k][1])
>>>>> but did you set s=0 to begin with?
>>>>> (you did set k=0, which makes no sense, as you immediately use k as a
>>>>> loop variable)
>>>>>
>>>>>
>>>> I don't think that's relevant.  Oliver stated earlier that the problem
>>>> happens simply while typing in code, and without even pressing enter (if
>>>> I've understood correctly).
>>>>
>>>> Oliver, no one here will laugh at your code (I hope! :) and if I
>>>> understand the problem it's nothing to do with anything specifically you
>>>> wrote anyways.
>>>>
>>>> A couple more questions.  You wrote
>>>>
>>>> > i used "Sage Mirror" to download the program and installed it with
>>>> adminstration rights
>>>>
>>>> When you installed did you select the "Install for all users" or
>>>> "Install just for the current user" option?  If the latter, you shouldn't
>>>> need Administrator permissions to install, unless this company machine has
>>>> additional policies configured restricting your ability to install
>>>> arbitrary software.  It shouldn't matter much here but I'm just curious you
>>>> say you installed with with Admin rights.
>>>>
>>>> Another question: If you run the "SageMath 8.6 Shell" shortcut, and run
>>>> the command `sage -ipython` (this starts the IPython prompt without any
>>>> Sage-specific code loaded) do you have any problems?  Are you able to enter
>>>> and run pure Python code like in your example above?
>>>>
>>>> Finally, do you know if there are any active virus scanners like
>>>> McAffee or Symantic. Basically anything on this list:
>>>> https://cygwin.com/faq/faq.html#faq.using.bloda   (note: Windows
>>>> Defender is normally not actually a problem, but it might be if it's in the
>>>> middle of performing a scan).
>>>>
>>>
>>>
>>> It occurs to me that this *might* be an instance of the (very technical)
>>> bug fixed by https://github.com/sagemath/cysignals/pull/108, and
>>> included into Sage 8.7 by https://trac.sagemath.org/ticket/27070
>>>
>>> If so, it's occurring in a context that I didn't previously know about
>>> but it's not impossible, especially if there is BLODA involved.  If nothing
>>> else it could be masking a different bug.
>>>
>>> I haven't made a Windows release for Sage 8.7 yet, in part because it
>>> needs some additional patches that were not included in the main 8.7
>>> release tarball.  I'm not happy about that but it can be dealt with by
>>> updating the build tools for the Windows release to include additional
>>> patches; I just need to do it.
>>>
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