[GRASS-user] v.centerline addon

cesar1 · March 4, 2020, 5:10pm

Hello!!!

I’m new user on GRASS and I’m trying to execute the addon v.centerline on GRASS 7.9. As input I’m using a shapefile containing line (MultiLineString) as geometry and when I have run the v.centerline an erro is returning:

“Traceback (most recent call last):

File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts

/v.centerline.py", line 319, in

main()

File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts

/v.centerline.py", line 111, in main

segment_input += 'P ’ + category.strip()

TypeError: can only concatenate str (not “bytes”) to str

(Wed Mar 4 17:27:25 2020) Comando terminado (3 segundos)

(Wed Mar 4 17:27:25 2020)

v.centerline input=Linha_rio_teste_Centerline@PERMANENT output=teste range=2 refline=2

Traceback (most recent call last):

File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts

/v.centerline.py", line 319, in

main()

File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts

/v.centerline.py", line 111, in main

segment_input += 'P ’ + category.strip()

TypeError: can only concatenate str (not “bytes”) to str

(Wed Mar 4 17:27:28 2020) Comando terminado (2 segundos)”

I would like help to try understand what’s happening.

Regards.

César de Paula

mlennert · March 5, 2020, 8:10am

On 4/03/20 18:10, cesar@fototerra.com.br wrote:

Hello!!!

I’m new user on GRASS and I’m trying to execute the addon v.centerline on GRASS 7.9. As input I’m using a shapefile containing line (MultiLineString) as geometry and when I have run the v.centerline an erro is returning:

*“Traceback (most recent call last):*

* File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts*

*/v.centerline.py", line 319, in <module>*

* main()*

* File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts*

*/v.centerline.py", line 111, in main*

* segment_input += 'P ' + category.strip()*

*TypeError: can only concatenate str (not "bytes") to str*

*(Wed Mar 4 17:27:25 2020) Comando terminado (3 segundos) *

*(Wed Mar 4 17:27:25 2020) *

*v.centerline input=Linha_rio_teste_Centerline@PERMANENT output=teste range=2 refline=2*

*Traceback (most recent call last):*

* File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts*

*/v.centerline.py", line 319, in <module>*

* main()*

* File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts*

*/v.centerline.py", line 111, in main*

* segment_input += 'P ' + category.strip()*

*TypeError: can only concatenate str (not "bytes") to str*

*(Wed Mar 4 17:27:28 2020) Comando terminado (2 segundos)”*

I would like help to try understand what’s happening.

I would guess that this is a Python 3 vs Python 2 issue. I never updated the addon to Python 3. If someone else can do this, it would be great, as I'm currently on mission abroad and do not really have the necessary access to the development tools to do this from here.

Moritz

cesar1 · March 5, 2020, 10:37am

Hi Moritz and colleagues!!

Thank you for write and being help me. About the python version make sense because I’m using Python 3.7.

I’ll try install Python 2.x and run again the addon v.centerline and I’ll tell about the result.

Tks.

César de Paula

De: Moritz Lennert mlennert@club.worldonline.be
Enviada em: quinta-feira, 5 de março de 2020 05:10
Para: cesar@fototerra.com.br; grass-user@lists.osgeo.org
Assunto: Re: [GRASS-user] v.centerline addon

On 4/03/20 18:10, cesar@fototerra.com.br wrote:

Hello!!!

I’m new user on GRASS and I’m trying to execute the addon v.centerline on GRASS 7.9. As input I’m using a shapefile containing line (MultiLineString) as geometry and when I have run the v.centerline an erro is returning:

“Traceback (most recent call last):

File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts

/v.centerline.py", line 319, in

main()

File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts

/v.centerline.py", line 111, in main

segment_input += 'P ’ + category.strip()

TypeError: can only concatenate str (not “bytes”) to str

(Wed Mar 4 17:27:25 2020) Comando terminado (3 segundos)

(Wed Mar 4 17:27:25 2020)

v.centerline input=Linha_rio_teste_Centerline@PERMANENT output=teste range=2 refline=2

Traceback (most recent call last):

File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts

/v.centerline.py", line 319, in

main()

File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts

/v.centerline.py", line 111, in main

segment_input += 'P ’ + category.strip()

TypeError: can only concatenate str (not “bytes”) to str

(Wed Mar 4 17:27:28 2020) Comando terminado (2 segundos)”

I would like help to try understand what’s happening.

I would guess that this is a Python 3 vs Python 2 issue. I never updated the addon to Python 3. If someone else can do this, it would be great, as I’m currently on mission abroad and do not really have the necessary access to the development tools to do this from here.

Moritz

mlennert · March 6, 2020, 4:34pm

Hi César,

Micha Silver sent a pull request that should solve your issue [1], but I currently do not have the access necessary to merge.

If one of the other developers can do it, please feel free, otherwise I'll do it on Monday.

Moritz

[1] https://github.com/OSGeo/grass-addons/commit/20f8becac918dbd2d81368e9a305e62fcb53efc9

Am 5. März 2020 11:37:14 GMT+01:00 schrieb cesar@fototerra.com.br:

Hi Moritz and colleagues!!

Thank you for write and being help me. About the python version make
sense
because Im using Python 3.7.

Ill try install Python 2.x and run again the addon v.centerline and
Ill
tell about the result.

Tks.

César de Paula

De: Moritz Lennert <mlennert@club.worldonline.be>
Enviada em: quinta-feira, 5 de março de 2020 05:10
Para: cesar@fototerra.com.br; grass-user@lists.osgeo.org
Assunto: Re: [GRASS-user] v.centerline addon

On 4/03/20 18:10, cesar@fototerra.com.br
<mailto:cesar@fototerra.com.br>
wrote:

Hello!!!

Im new user on GRASS and Im trying to execute the addon v.centerline
on
GRASS 7.9. As input Im using a shapefile containing line
(MultiLineString)
as geometry and when I have run the v.centerline an erro is returning:

Traceback (most recent call last):

File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts

/v.centerline.py", line 319, in <module>

   main()

File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts

/v.centerline.py", line 111, in main

   segment_input += 'P ' + category.strip()

TypeError: can only concatenate str (not "bytes") to str

(Wed Mar 4 17:27:25 2020) Comando terminado (3 segundos)

(Wed Mar 4 17:27:25 2020)

v.centerline input=Linha_rio_teste_Centerline@PERMANENT output=teste
range=2
refline=2

Traceback (most recent call last):

File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts

/v.centerline.py", line 319, in <module>

   main()

File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts

/v.centerline.py", line 111, in main

   segment_input += 'P ' + category.strip()

TypeError: can only concatenate str (not "bytes") to str

(Wed Mar 4 17:27:28 2020) Comando terminado (2 segundos)

I would like help to try understand whats happening.

I would guess that this is a Python 3 vs Python 2 issue. I never
updated the
addon to Python 3. If someone else can do this, it would be great, as
I'm
currently on mission abroad and do not really have the necessary access
to
the development tools to do this from here.

Moritz

mlennert · March 6, 2020, 5:46pm

MarkusM just merged the PR so you can reinstall the extension and see if it works with your python 3 installation now.

Moritz

Am 6. März 2020 17:34:12 GMT+01:00 schrieb Moritz Lennert <mlennert@club.worldonline.be>:

Hi César,

Micha Silver sent a pull request that should solve your issue [1], but
I currently do not have the access necessary to merge.

If one of the other developers can do it, please feel free, otherwise
I'll do it on Monday.

Moritz

[1]
https://github.com/OSGeo/grass-addons/commit/20f8becac918dbd2d81368e9a305e62fcb53efc9

Am 5. März 2020 11:37:14 GMT+01:00 schrieb cesar@fototerra.com.br:

Hi Moritz and colleagues!!

Thank you for write and being help me. About the python version make
sense
because Im using Python 3.7.

Ill try install Python 2.x and run again the addon v.centerline and
Ill
tell about the result.

Tks.

César de Paula

De: Moritz Lennert <mlennert@club.worldonline.be>
Enviada em: quinta-feira, 5 de março de 2020 05:10
Para: cesar@fototerra.com.br; grass-user@lists.osgeo.org
Assunto: Re: [GRASS-user] v.centerline addon

On 4/03/20 18:10, cesar@fototerra.com.br
<mailto:cesar@fototerra.com.br>
wrote:

Hello!!!

Im new user on GRASS and Im trying to execute the addon v.centerline
on
GRASS 7.9. As input Im using a shapefile containing line
(MultiLineString)
as geometry and when I have run the v.centerline an erro is returning:

Traceback (most recent call last):

File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts

/v.centerline.py", line 319, in <module>

   main()

File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts

/v.centerline.py", line 111, in main

   segment_input += 'P ' + category.strip()

TypeError: can only concatenate str (not "bytes") to str

(Wed Mar 4 17:27:25 2020) Comando terminado (3 segundos)

(Wed Mar 4 17:27:25 2020)

v.centerline input=Linha_rio_teste_Centerline@PERMANENT output=teste
range=2
refline=2

Traceback (most recent call last):

File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts

/v.centerline.py", line 319, in <module>

   main()

File "C:\Users\cesar\AppData\Roaming\GRASS7\addons/scripts

/v.centerline.py", line 111, in main

   segment_input += 'P ' + category.strip()

TypeError: can only concatenate str (not "bytes") to str

(Wed Mar 4 17:27:28 2020) Comando terminado (2 segundos)

I would like help to try understand whats happening.

I would guess that this is a Python 3 vs Python 2 issue. I never
updated the
addon to Python 3. If someone else can do this, it would be great, as
I'm
currently on mission abroad and do not really have the necessary

access

to
the development tools to do this from here.

Moritz

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