python Bokeh生成的图片保存成png

step1，
from bokeh.io import export_png
export_png(p , filename=title1+”.png”)
报错：
RuntimeError: PhantomJS is not present in PATH. Try
“conda install phantomjs” or “npm install -g phantomjs-prebuilt”

step2
直接下载 phantomjs 会失败，找到脚本之家的phantomjs可以直接下载。
phantomjs-2.1.1-windows.zip

step3
配置环境变量
将解压的bin目录的路径配置到环境变量中去

step4
如果出现报错phantom还是木有，关闭cmd重新开一次就有了。
不过还是会有warning：
r.py:49: UserWarning: Selenium support for PhantomJS has been deprecated, please
use headless versions of Chrome or Firefox instead
warnings.warn(‘Selenium support for PhantomJS has been deprecated, please use
headless ‘