Backtrader绘图cerebro.plot报错问题的处理
1.问题描述
在jupyter 中使用BackTrader ,使用绘图功能时:
cerebro.plot()
提示错误:ValueError: Axis limits cannot be NaN or Inf
由于backtrader 要求有7列数据,最后一列openinterest ,以为缺少此列数据,补齐最后一列。
data[‘openinterest’] = 0
数据显示效果如下:
open high low close vol openinterest
date
2020-01-02 119.3010 124.4880 119.3010 123.7272 184419.14 0
2020-01-03 123.3814 125.3871 121.6524 124.6263 140995.19 0
2020-01-06 125.1796 135.8302 123.5198 133.6171 425339.29 0
2020-01-07 133.8246 137.6284 131.9573 133.8938 250923.45 0
2020-01-08 135.0695 141.9855 133.3405 138.8041 412035.84 0
数据上肯定没有0和无穷大值,问题依然存在。
2. 问题处理过程
(1)安装组件 ipympl
Jupyter Lab 通过 jupyter-matplotlib extension 支持交互式 matplotlib 。由于ipympl Jupyter Lab版本需要NodeJS 。
pip install ipympl
安装过程中,可以看到安装了Nodejs 。
# pip install ipympl
Looking in indexes: https://pypi.douban.com/simple/
Collecting ipympl
Downloading https://mirrors.cloud.tencent.com/pypi/packages/08/5b/83a88a44e5dd185104c400e0ed6cdba50c776a8f494d525298bb09db2e5c/ipympl-0.9.3-py2.py3-none-any.whl (511 kB)
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Collecting ipywidgets<9,>=7.6.0
Downloading https://mirrors.cloud.tencent.com/pypi/packages/4a/0e/57ed498fafbc60419a9332d872e929879ceba2d73cb11d284d7112472b3e/ipywidgets-8.1.1-py3-none-any.whl (139 kB)
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Collecting jupyterlab-widgets~=3.0.9
Downloading https://mirrors.cloud.tencent.com/pypi/packages/e8/05/0ebab152288693b5ec7b339aab857362947031143b282853b4c2dd4b5b40/jupyterlab_widgets-3.0.9-py3-none-any.whl (214 kB)
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Collecting widgetsnbextension~=4.0.9
Downloading https://mirrors.cloud.tencent.com/pypi/packages/29/03/107d96077c4befed191f7ad1a12c7b52a8f9d2778a5836d59f9855c105f6/widgetsnbextension-4.0.9-py3-none-any.whl (2.3 MB)
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Installing collected packages: widgetsnbextension, jupyterlab-widgets, ipywidgets, ipympl
Successfully installed ipympl-0.9.3 ipywidgets-8.1.1 jupyterlab-widgets-3.0.9 widgetsnbextension-4.0.9
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
(nlp) [root@bigdata Thread231031]# pip install nodejs-bin
Looking in indexes: https://pypi.douban.com/simple/
Collecting nodejs-bin
Downloading https://mirrors.cloud.tencent.com/pypi/packages/14/f5/b85f10ddb2b6bf58395bd08a7794ded91518f7eca1dc771c22c808c44e81/nodejs_bin-18.4.0a4-py3-none-manylinux_2_12_x86_64.manylinux2010_x86_64.whl (47.3 MB)
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Installing collected packages: nodejs-bin
Successfully installed nodejs-bin-18.4.0a4
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
(2)出现 Javascript Error: IPython is not defined
使用以下命令绘图,还是失败
cerebro.plot()
cerebro.plot(iplot=False)
用两种方式绘图,都是报 Javascript Error: IPython is not defined 错误。
matplotlib 的版本是 3.7.1 ,网上建议是 3.2.2,与BackTrader 兼容,不建议更高版本。
#pip list | grep matplot
matplotlib 3.7.1
matplotlib-inline 0.1.6
卸载matplotlib ,重新安装3.2.2版本:
pip uninstall matplotlib
pip install matplotlib==3.2.2
重启jupyter 。
使用 matplotlib inline 组件,绘图加参数 iplot=False
%matplotlib inline
cerebro.plot(iplot=False)
终于可以在jupyter 中BackTrader 绘制收益图示,贴张图纪念一下: