如果A已经开发好一个扩展模块test，B要加载A开发的扩展模块。
跟 Slicer学习笔记（十七）编写一个python扩展模块中的前2步一样，第3步选择“Select Extension”,然后指定目录到扩展模块的目录。
如果模块加载失败，可以从 View --> Error Log中去查看加载失败的原因。
比如查看到加载失败的原因是：
ModuleNotFoundError: No module named 'pandas'
那么就需要在slicer的环境中安装缺少的模块。
3、安装缺少的模块在slicer的python Interactor中执行下面的命令安装：
pip_install("pandas")
然后就会把缺少的模块安装上：
>>> pip_install("pandas")
Collecting pandas
Downloading pandas-1.1.5-cp36-cp36m-win_amd64.whl (8.7 MB)
Requirement already satisfied: numpy>=1.15.4 in c:programdatana-micslicer 4.11.20210226libpythonlibsite-packages (from pandas) (1.19.2)
Collecting python-dateutil>=2.7.3
Downloading python_dateutil-2.8.2-py2.py3-none-any.whl (247 kB)
Requirement already satisfied: six>=1.5 in c:programdatana-micslicer 4.11.20210226libpythonlibsite-packages (from python-dateutil>=2.7.3->pandas) (1.15.0)
Collecting pytz>=2017.2
Downloading pytz-2021.1-py2.py3-none-any.whl (510 kB)
Installing collected packages: pytz, python-dateutil, pandas
Successfully installed pandas-1.1.5 python-dateutil-2.8.2 pytz-2021.1
WARNING: You are using pip version 20.3.3; however, version 21.2.4 is available.
You should consider upgrading via the 'C:ProgramDataNA-MICSlicer 4.11.20210226binpython-real.exe -m pip install --upgrade pip' command.
