运行时报错：
Traceback (most recent call last):
File "***.py", line 5, in <module>
from PIL import Image
ModuleNotFoundError: No module named 'PIL'
运行安装pillow命令:
pip install pillow
如果运行时显示
Requirement already satisfied: pillow in /anaconda3/lib/python3.7/site-packages (5.4.1)
表示已经安装过了，这时可以先卸载，获取最新的pillow
运行卸载命令: pip uninstall pillow
然后再次运行安装命令
pip install pillow
easy_install Pillow
python3 -m pip install pillow
pip install -i https://pypi.douban.com/simple pillow
安装完毕，需要检查一下安装是否成功。
打开python后，输入 from PIL import Image
cs
