point_cloud_chapter1_env

0 先说一下我的安装环境，Ubuntu18.04,anaconda3,python3

1 首先，将cloud_lesson.yml中的pip安装部分copy出来，形成新的pip依赖文件requirements.txt
2 然后，用pip install -r requirements.txt -i https://pypi.douban.com/simple来安装
3 安装到pyangbind-brcd==0.6.14时，会遇到ModuleNotFoundError: No module named 'pip.req'错误，wget下载源码，
将
from pip.req import parse_requirements
修改为
try: # for pip >= 10
    from pip._internal.req import parse_requirements
except ImportError: # for pip <= 9.0.3
    from pip.req import parse_requirements

4 继续，如果遇到AttributeError: 'ParsedRequirement' object has no attribute 'req'
pip install pip==20.0.2 -i https://pypi.douban.com/simple

至此，pyangbind-brcd==0.6.14应该安装完毕了

5 将requirements.txt中的pyangbind-brcd==0.6.14注释掉，继续用pip install -r requirements.txt -i https://pypi.douban.com/simple来安装
还有一些问题，于是注释掉一些无用的库，重新安装，应该成功。

最后requirements.txt长这个样子

appnope==0.1.0
attrs==19.3.0
backcall==0.1.0
#bitarray==1.2.1
bleach==3.1.4
decorator==4.4.2
defusedxml==0.6.0
entrypoints==0.3
importlib-metadata==1.6.0
ipykernel==5.2.0
ipython==7.13.0
ipython-genutils==0.2.0
ipywidgets==7.5.1
jedi==0.16.0
jinja2==2.11.1
jsonschema==3.2.0
#jupyter-client==6.1.2
#jupyter-core==4.6.3
lxml==4.5.0
markupsafe==1.1.1
mistune==0.8.4
more-itertools==8.2.0
nbconvert==5.6.1
nbformat==5.0.4
#notebook==6.0.3
open3d-python==0.7.0.0
packaging==20.3
pandocfilters==1.4.2
parso==0.6.2
pexpect==4.8.0
pickleshare==0.7.5
pluggy==0.13.1
prometheus-client==0.7.1
prompt-toolkit==3.0.5
ptyprocess==0.6.0
py==1.8.1
pyang==2.2.1
#pyangbind-brcd==0.6.14
pybind==0.1.35
pygments==2.6.1
pyrsistent==0.16.0
pytest==5.4.1
pyzmq==19.0.0
send2trash==1.5.0
#terminado==0.8.3
testpath==0.4.4
traitlets==4.3.3
wcwidth==0.1.9
webencodings==0.5.1
widgetsnbextension==3.5.1
zipp==3.1.0