Ubuntu22.04下给Blender2.79a内置Python3.5安装easydict报错求助

背景 #

必须使用Blender 2.79a，不确定该错误在Ubuntu 22.04中是否可修复，也可接受在Docker中使用旧版Ubuntu。原pvnet-rendering仓库基于*已停止维护（EOL）*的Ubuntu 16.04。

操作步骤 #

(base) mona@ada:~$ wget https://download.blender.org/release/Blender2.79/blender-2.79a-linux-glibc219-x86_64.tar.bz2
(base) mona@ada:~$ tar -xvf blender-2.79a-linux-glibc219-x86_64.tar.bz2 
(base) mona@ada:~$ git clone https://github.com/zju3dv/pvnet-rendering
(base) mona@ada:~$ cd pvnet-rendering/
/home/mona/blender-2.79a-linux-glibc219-x86_64/2.79/python/bin/python3.5m -m venv pvnet-rendering
source pvnet-rendering/bin/activate

运行项目时的错误 #

(pvnet-rendering) (base) mona@ada:~/pvnet-rendering$ python  run.py --type rendering
Traceback (most recent call last):
  File "run.py", line 1, in <module>
    from config import cfg
  File "/home/mona/pvnet-rendering/config.py", line 1, in <module>
    from easydict import EasyDict
ImportError: No module named 'easydict'

安装easydict时的报错 #

(pvnet-rendering) (base) mona@ada:~/pvnet-rendering$ pip install easydict
Exception:
Traceback (most recent call last):
  File "/home/mona/pvnet-rendering/pvnet-rendering/lib/python3.5/site-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/home/mona/pvnet-rendering/pvnet-rendering/lib/python3.5/site-packages/pip/commands/install.py", line 272, in run
    with self._build_session(options) as session:
  File "/home/mona/pvnet-rendering/pvnet-rendering/lib/python3.5/site-packages/pip/basecommand.py", line 69, in _build_session
    if options.cache_dir else None
  File "/home/mona/blender-2.79a-linux-glibc219-x86_64/2.79/python/lib/python3.5/posixpath.py", line 89, in join
    genericpath._check_arg_types('join', a, *p)
  File "/home/mona/blender-2.79a-linux-glibc219-x86_64/2.79/python/lib/python3.5/genericpath.py", line 143, in _check_arg_types
    (funcname, s.__class__.__name__)) from None
TypeError: join() argument must be str or bytes, not 'int'
Traceback (most recent call last):
  File "/home/mona/pvnet-rendering/pvnet-rendering/bin/pip", line 11, in <module>
    sys.exit(main())
  File "/home/mona/pvnet-rendering/pvnet-rendering/lib/python3.5/site-packages/pip/__init__.py", line 233, in main
    return command.main(cmd_args)
  File "/home/mona/pvnet-rendering/pvnet-rendering/lib/python3.5/site-packages/pip/basecommand.py", line 251, in main
    timeout=min(5, options.timeout)) as session:
  File "/home/mona/pvnet-rendering/pvnet-rendering/lib/python3.5/site-packages/pip/basecommand.py", line 69, in _build_session
    if options.cache_dir else None
  File "/home/mona/blender-2.79a-linux-glibc219-x86_64/2.79/python/lib/python3.5/posixpath.py", line 89, in join
    genericpath._check_arg_types('join', a, *p)
  File "/home/mona/blender-2.79a-linux-glibc219-x86_64/2.79/python/lib/python3.5/genericpath.py", line 143, in _check_arg_types
    (funcname, s.__class__.__name__)) from None
TypeError: join() argument must be str or bytes, not 'int'

解决方案 #

方案1：显式指定pip缓存目录 #

错误源于旧版pip处理缓存目录时，环境变量中存在非字符串类型参数。执行安装时直接指定字符串格式的缓存路径：

pip install easydict --cache-dir /tmp/pip_cache

若临时目录权限受限，可改用用户目录下的路径：

pip install easydict --cache-dir ~/.pip_cache

方案2：升级pip到兼容Python3.5的最新版本 #

Blender自带的pip版本过旧，先升级pip（同样指定缓存目录规避报错）：

pip install --upgrade pip --cache-dir /tmp/pip_cache

升级完成后再安装easydict：

pip install easydict

方案3：Docker部署Ubuntu16.04环境（推荐） #

原项目基于EOL的Ubuntu16.04，直接在该环境下运行兼容性最佳：

1. 拉取Ubuntu16.04镜像：

docker pull ubuntu:16.04

2. 创建并进入容器：

docker run -it --name pvnet-render ubuntu:16.04 /bin/bash

3. 在容器内安装git、wget等依赖后，重复原操作步骤即可。

方案4：直接安装到Blender自带Python环境 #

跳过虚拟环境，使用Blender自带的pip安装模块：

/home/mona/blender-2.79a-linux-glibc219-x86_64/2.79/python/bin/pip install easydict

运行项目时，确保使用Blender的Python解释器执行：

/home/mona/blender-2.79a-linux-glibc219-x86_64/2.79/python/bin/python run.py --type rendering

内容的提问来源于stack exchange，提问作者Mona Jalal