numpy results in segmentation fault

[Pradeep Patra]

Hi ,

I was trying to solve the hackerrank and was using python 3.7.x.
https://www.hackerrank.com/challenges/np-concatenate/problem

While running the code sometimes I get success result and sometimes it
fails with "Segmentation Fault" at Hacker rank UI. I dont have any clue why
the code is crashing ? Does anyone have any idea?

Regards
Pradeep

import numpy

n,m,p = map(int,input().split())
tgt_arr1 = []
for i in range(n):
row = list(map(int,input().split()))
tgt_arr1.append(row)
tgt_arr2 = []
for j in range(m):
row = list(map(int,input().split()))
tgt_arr2.append(row)

num_arr1 = numpy.array(tgt_arr1,int)
num_arr2 = numpy.array(tgt_arr2,int)

print(numpy.concatenate((num_arr1,num_arr2),axis=0))

[Thomas Jollans]

On 12/09/2019 15.53, Pradeep Patra wrote:
> Hi ,
>
> I was trying to solve the hackerrank and was using python 3.7.x.
> https://www.hackerrank.com/challenges/np-concatenate/problem
>
> While running the code sometimes I get success result and sometimes it
> fails with "Segmentation Fault" at Hacker rank UI. I dont have any clue why
> the code is crashing ? Does anyone have any idea?

Are you sure it's your code that's crashing, and not something beyond
your control? (Such as the software that is starting Python for you)
Does it depend on the input? Can you reproduce the issue in a controlled
environment (i.e. on your own PC)?

[Pradeep Patra]

Yes it is crashing in the hackerrank site and the testcases fails with
segmentation fault. I tried to install numpy with 3.7.3 and it is for some
reason not working and after import when I run import numpy at python
console and press enter I get >>? i,e its not working properly.

Can you please help letting me know the python and numpy compatibility
matrix or I am missing anything?

I tried some of the numpy code from the other github and it also fails with
the segmentation fault :-(. I am guessing some numpy version compatility
issue or some environment issue.

> --
> https://mail.python.org/mailman/listinfo/python-list
>

[Thomas Jollans]

Please reply on-list. (both of you)



-------- Forwarded Message --------
Subject: Re: numpy results in segmentation fault
Date: Mon, 16 Sep 2019 17:04:57 +0530
From: Test Bot <online...@gmail.com>
To: Pradeep Patra <smileso...@gmail.com>
CC: Thomas Jollans <tj...@tjol.eu>



Firstly, in response to this

"
I tried to install numpy with 3.7.3 and it is for some
reason not working and after import when I run import numpy at python
console and press enter I get >>? i,e its not working properly.
"

the >> prompt after import numpy signifies that the numpy module has
been loaded and is available in the session.

Can you please provide the traceback you are getting along with the input.

PS - Also, you have some coins like thing on hackerrank I guess to
reveal the test cases, in case everything else fails.

--
https://mail.python.org/mailman/listinfo/python-list

[Test Bot]

Firstly, in response to this
"
I tried to install numpy with 3.7.3 and it is for some
reason not working and after import when I run import numpy at python
console and press enter I get >>? i,e its not working properly.
"

the >> prompt after import numpy signifies that the numpy module has been
loaded and is available in the session.

Can you please provide the traceback you are getting along with the input.

PS - Also, you have some coins like thing on hackerrank I guess to reveal
the test cases, in case everything else fails.

On Mon, Sep 16, 2019 at 5:32 PM Thomas Jollans <tj...@tjol.eu> wrote:

> Please reply on-list. (both of you)
>
>
> -------- Forwarded Message --------
> Subject: Re: numpy results in segmentation fault
> Date: Mon, 16 Sep 2019 17:04:57 +0530
> From: Test Bot <online...@gmail.com> <online...@gmail.com>
> To: Pradeep Patra <smileso...@gmail.com> <smileso...@gmail.com>
> CC: Thomas Jollans <tj...@tjol.eu> <tj...@tjol.eu>
>
> Firstly, in response to this
> "
> I tried to install numpy with 3.7.3 and it is for some
> reason not working and after import when I run import numpy at python
> console and press enter I get >>? i,e its not working properly.
> "
>
> the >> prompt after import numpy signifies that the numpy module has been
> loaded and is available in the session.
>
> Can you please provide the traceback you are getting along with the input.
>
> PS - Also, you have some coins like thing on hackerrank I guess to reveal
> the test cases, in case everything else fails.
>
> On Mon, Sep 16, 2019 at 3:08 PM Pradeep Patra <smileso...@gmail.com>

> wrote:
>
>> Yes it is crashing in the hackerrank site and the testcases fails with
>> segmentation fault. I tried to install numpy with 3.7.3 and it is for some
>> reason not working and after import when I run import numpy at python
>> console and press enter I get >>? i,e its not working properly.
>>
>> Can you please help letting me know the python and numpy compatibility
>> matrix or I am missing anything?
>>
>> I tried some of the numpy code from the other github and it also fails
>> with
>> the segmentation fault :-(. I am guessing some numpy version compatility
>> issue or some environment issue.
>>

[Aldwin Pollefeyt]

use:

num_arr1 = numpy.array(tgt_arr1, dtype=int)
num_arr2 = numpy.array(tgt_arr2, dtype=int)


On Mon, Sep 16, 2019 at 5:36 PM Pradeep Patra <smileso...@gmail.com>