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RQAlpha BUG Issue#219

Pingback https://github.com/ricequant/rqalpha/issues/219

Hello, RQAlpha Team

RQAlpha is really a effective tool for price back-testing.

I found something wrong when using command `# rqalpha plot someresult.pkl` to plot my back-testing result. It came out a blank window. I tried to solve this problem and found something interesting.

in `rqalpha/rqalpha/mod/rqalpha_mod_sys_analyser/plot.py`, line 52-53

 portfolio = result_dict["portfolio"]
 benchmark_portfolio = result_dict.get("benchmark_portfolio")

 print portfolio.index
 print benchmark_portfolio.index

by printing portfolio.index and benchmark_portfolio.index , I found an unreasonable difference.

![image](https://user-images.githubusercontent.com/4476941/33165321-59a13c02-d071-11e7-80e1-b41a5fbdd6db.png)

According to https://github.com/pandas-dev/pandas/issues/8614 says, matplotlib can not plotting when DatetimeIndex is created by pandas > 0.15 .

I found a temporary way to solve this problem. and finally plotting was working functionally.

Use `index.to_pydatetime()` to explicitly convert `DatetimeIndex` type index to Python `Datetime` type.

For example: modify `rqalpha/rqalpha/mod/rqalpha_mod_sys_analyser/plot.py`, line 152
`ax.plot(portfolio[“unit_net_value”] – 1.0, label=_(u”strategy”), alpha=1, linewidth=2, color=red)`
to
`ax.plot(index.to_pydatetime(),portfolio[“unit_net_value”] – 1.0, label=_(u”strategy”), alpha=1, linewidth=2, color=red)`

Although it is not the best way to solve this problem, I know you can find the best one finally.
And I hope these information may help you.

Thanks.

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