I use Spyder and here is my solution (Some hack).

1. Change the spyder setting : "Preferences" -> "IPython console" -> "Graphics" tab -> "Graphics backend" -> "Backend" -> "Automatic"
2. Restart the current Console (The one inside spyder)
3. Import below in sequence

import matplotlib
import matplotlib.pyplot as plt

import backtrader as bt
import backtrader.indicators as btind
import backtrader.analyzers as btanalyzers
import backtrader.feeds as btfeeds
import backtrader.strategies as btstrats
import backtrader.plot

matplotlib.use('Qt5Agg')
plt.switch_backend('Qt5Agg')

4. Plot with iplot = false

cerebro.plot(height= 30, iplot= False)

5. Run your code and you should see a separate windows pop up

@backtrader thanks for the prompt reply!
I will work on it later.

It is very common to reference the 200-days moving average during trade,
I am trying to implement an intraday strategy, which will taking account the 200-days moving average.

However, I can't figure out how to load 200-days bar while I loaded 1-min data into backtrader

Also, I just wonder how can we start live trade in day-by-day manner, that the strategy can reference 200-days MA immediately in the start of trade?

Any ideas ? so much thanks.

having the same problems here, and no kidding, it was killing me.
I spent hours and hours to figure the solution and even pycharm can't help. ( Don't know why )
I tried subclass the "backtrader.plot.Plot" but still not working.

If you really want to use spyder, here is the trick :

import backtrader.plot
import matplotlib
matplotlib.use('QT5Agg')

# Your running code

cerebro.plot(iplot= False)

Remember to select your Graphic backend to "Qt5" in spyder.
You should see the windows pop out (It can even be maximizing ! how great...)

I am using win10 , Anaconda , Spyder 3.3.2 , Py 3.7.1, Ipyhon 7.2.0

(User from Hong Kong. Thanks for the platform, it's really great.)