Change name of a line in indicator

[winefx]

Hi, I'm new to backtrader.... How do I change the _name of a line in a indicator? I tried:

    x = btind.Momentum(self.datas[0], period=7, plotname='MyMomentum')
    x.plotlines = dict(momentum=dict(_name='mymomentum'))

The plotname is changed to MyMomentum, but the line name is still 'momentum' instead of 'mymomentum'. Thanks.

[ab_trader]

@winefx based on examples shown in docs, you may need to subclass an indicator and use plotlines inside new class. I did it this way when modified line properties.

docs - plotting

[backtrader]

@winefx said in Change name of a line in indicator:

x.plotlines = dict(momentum=dict(_name='mymomentum'))

You are actually removing the existing plotlines object and replacing it with a dict. Using a dict (or a tuple) works when you are declaring the plotlines, but in this case you are removing what the platform has done in the background.

x.plotlines.momentum._name = `mymomentum`

should do the trick.

[winefx]

@backtrader Great thanks!

[backtrader]

The alternative as suggested by @ab_trader is to subclass the indicator and then do what you did with the dictionary assignment in the class declaration.

It is obviously a more permanent solution.