Python 3.8 compatibility issue

[DarkGeekMS]

My Environment

• Operating System and version: Ubuntu 20.04
• Python version: 3.8

Context

I'm unable to install python-pcl in a python3.8 environment. I always got this error :

ERROR: Command errored out with exit status 1:
     command: /home/<name>/anaconda3/envs/pytorch_dev/bin/python3.8 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-9nm8v2ed/python-pcl/setup.py'"'"'; __file__='"'"'/tmp/pip-install-9nm8v2ed/python-pcl/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-p197x2th
         cwd: /tmp/pip-install-9nm8v2ed/python-pcl/
    Complete output (6 lines):
    /tmp/pip-install-9nm8v2ed/python-pcl/setup.py: error: cannot find PCL, tried
        pkg-config pcl_common-1.9
        pkg-config pcl_common-1.8
        pkg-config pcl_common-1.7
        pkg-config pcl_common-1.6
        pkg-config pcl_common
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

However, the installation works fine in a python3.6 environment. I tried installation with pip and from source, but the error persists.

I was wondering if there is any workaround for installing python-pcl in a python3.8 environment ? And is there any plan for adding python3.8 support ?

Thanks!

[guodashun]

Maybe you can try sudo apt install python3-pcl It just supports python3.8 env.

[DarkGeekMS]

I've tried, however I'm using conda environment, which, I think, isn't supported. I might try python3.8 venv.

[moonstarsky37]

I had tried python3.8 venv. I think still not support now

[guodashun]

I had tried python3.8 venv. I think still not support now

For me the ubuntu version is 20.04, so there is an available package in apt-list.

[moonstarsky37]

For me the ubuntu version is 20.04, so there is an available package in apt-list.

Yep, I know that is an available package in apt-list. But after install by sudo apt install python3-pcl Then, I test by python -c 'import pcl' Show ModuleNotFoundError: No module named 'pcl' Also, I then tried pip install python-pcl but still have some error.

I using following on Ubuntu 20.04. If I do something wrong, let me know, thx.

sudo apt-get install python3.8 python3.8-dev python3.8-distutils python3.8-venv
python3.8 -m venv dev3.8/
source dev3.8/bin/activate
sudo apt install python3-pcl
python -c 'import pcl'

[guodashun]

For me the ubuntu version is 20.04, so there is an available package in apt-list.

Yep, I know that is an available package in apt-list. But after install by sudo apt install python3-pcl Then, I test by python -c 'import pcl' Show ModuleNotFoundError: No module named 'pcl' Also, I then tried pip install python-pcl but still have some error.

I using following on Ubuntu 20.04. If I do something wrong, let me know, thx.

sudo apt-get install python3.8 python3.8-dev python3.8-distutils python3.8-venv
python3.8 -m venv dev3.8/
source dev3.8/bin/activate
sudo apt install python3-pcl
python -c 'import pcl'

Maybe you can check your site-packages folder to make sure that the package pcl is in the right env.

[DarkGeekMS]

As @guodashun said, For Ubuntu 20.04, it worked for me as well on python3 venv, however it's still not compatible with conda envs.

[sanosay]

Do we have any update regarding support in conda env?

[astraw]

We are seeking a maintainer. Please see https://github.com/strawlab/python-pcl/issues/395.

[BeBeBerr]

Do we have any update regarding support in conda env?

You can manually copy it to your conda env after apt install. It works fine for me with python3.6.

[Petros626]

I had tried python3.8 venv. I think still not support now

For me the ubuntu version is 20.04, so there is an available package in apt-list.

can you specify it ?

[linhushaoxia-le]

from https://python-pcl-fork.readthedocs.io/en/rc_patches4/install.html. In the "installation guide" part, it is said "python-pcl is supported on Python 2.7.6+, 3.4.0, 3.5.0+, 3.6.0+"

[xiaoliangbai]

Manually copy pcl to site-packages does not work with 3.7:

.....${ENV_PATH}....../lib/python3.7/site-packages/pcl/init.py in 1 # XXX do a more specific import! ----> 2 from ._pcl import * 3 # vtkSmartPointer.h error (Linux) 4 # from .pcl_visualization import * 5 # from .pcl_grabber import *

ModuleNotFoundError: No module named 'pcl._pcl'

[where2go947]

My Environment

Ubuntu 20.04 python version: 3.8

Solutions

• Install python-pcl from ubuntu source

sudo apt-get update
sudo apt-get install python3-pcl pcl-tools

• Now that in the default "global" base environment, open a new shell, the pcl should work

python -c 'import pcl'

• To work on virtual environment like venv or anaconda, copy the pcl directories to the target dir.
• First, check directories, pcl and python_pcl-0.3.egg-info are supposed to be existed.

cd /usr/lib/python3/dist-packages
ls -l | grep pcl

• Then, copy them to ~/tmp and change owner, group and permission. Note replace user-name with your user name.

sudo cp -r pcl ~/tmp
sudo cp -r python_pcl-0.3.egg-info/ ~/tmp
cd ~/tmp && ls -l
sudo chown -R user-name pcl python_pcl-0.3.egg-info
sudo chgrp -R user-name pcl python_pcl-0.3.egg-info
sudo chmod -R 775 pcl python_pcl-0.3.egg-info
ls -l

• Finally, move them to your target dir. Note replace ~/.virtualenvs/env-name or ~/anaconda/envs/py38with your virtualenv environment path.

# for venv
cp -r pcl python_pcl-0.3.egg-info ~/.virtualenvs/env-name/lib/python3.8/site-packages
# or for anaconda
cp -r pcl python_pcl-0.3.egg-info ~/anaconda/envs/py38/lib/python3.8/site-packages

# After copy do not forget to remove dirs in `~/tmp`.
rm -rf pcl python_pcl-0.3.egg-info

• Now activate the virtual environment. Check:

python -c 'import pcl'

Hope helps.

[wzhou-abyss]

Hi @where2go947 , I got this error after following your solutions. Any idea what went wrong? I'm on Ubuntu22.04 with python 3.8

ModuleNotFoundError: No module named 'pcl._pcl'