I just want to customize the colours and thicknesses of the various lines in Ichimoku.
I had no idea it was going to be this hard:

1. There is no way to customize colours using the plotinfo variable, so I have to do this via PlotScheme (which didn't work either)
2. There also isn't a way to customize line thickness, only on horizontal lines. Why?

From the documentation on Plotting:
https://www.backtrader.com/docu/plotting/plotting.html

I can pass a custom list to cerebro.plot as lcolors:
lcolors=['blue', 'green', 'red', 'turquoise']

But since PlotScheme.color() uses tab10_index, I cannot change the order in which the colours are used!
tab10_index = [3, 0, 2, 1, 2, 4, 5, 6, 7, 8, 9]
So since 'turquoise' is index 3, it will be used first. Then blue, red, green. Why does there need to be an array that picks specific colours from the Tableau 10 palette in that specific order anyway?

OK, let's say the proper solution is to subclass PlotScheme. But I cannot import it either, even though I can import every other folder around it, and there is a init.py in backtrader/plot/:

In [3]: import backtrader as bt

In [4]: bt.plot
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-4-f26508c6d1b4> in <module>()
----> 1 bt.plot

AttributeError: module 'backtrader' has no attribute 'plot'

In [5]: bt.observers
Out[5]: <module 'backtrader.observers' from '/Users/shinichi/source/cryptocoins/backtrader/observers/__init__.py'>

In [6]: bt.signals
Out[6]: <module 'backtrader.signals' from '/Users/shinichi/source/cryptocoins/backtrader/signals/__init__.py'>

In [7]: bt.sizers
Out[7]: <module 'backtrader.sizers' from '/Users/shinichi/source/cryptocoins/backtrader/sizers/__init__.py'>

In [8]: bt.stores
Out[8]: <module 'backtrader.stores' from '/Users/shinichi/source/cryptocoins/backtrader/stores/__init__.py'>

In [9]: 

I must be missing something here because backtrader looks pythonic, but is actually very confusing.

The documentation should make it more obvious that in order to customize plotting, the intended route is to subclass the Indicator and override its self.plotlines via self._plotinit(). Looking at plotlines=(dict()) doesn't help.

This is my code:

import ipdb
import backtrader as bt
import pandas

cerebro = bt.Cerebro(stdstats=False)
cerebro.addstrategy(bt.Strategy)

dataframe = pandas.read_json('BTC_XMR-30m.json')

data = bt.feeds.PandasData(
    dataname=dataframe,
    datetime=1
)
cerebro.adddata(data)

cerebro.run()
cerebro.plot(style='bar')

dataframe looks like this:

      close                date      high       low      open  quoteVolume  \
0  0.004200 2014-07-18 16:00:00  0.004316  0.004030  0.004045  3412.578648   
1  0.004180 2014-07-18 16:30:00  0.004295  0.004180  0.004295    80.464673   
2  0.004226 2014-07-18 17:00:00  0.004500  0.004150  0.004195  2041.539606   
3  0.004404 2014-07-18 17:30:00  0.004509  0.004226  0.004226  1840.058267   
4  0.004435 2014-07-18 18:00:00  0.004511  0.004404  0.004404   866.016845   

      volume  weightedAverage  
0  14.166824         0.004151  
1   0.338532         0.004207  
2   8.865568         0.004343  
3   8.079922         0.004391  
4   3.851588         0.004447  

According to the docs I can tell PandasData that the date is in column 1, which I did in the constructor. But then it fails with this:

(exch) shinichi@ayanami ~/source/poloniex $ ipython --pdb importer.py
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
~/.virtualenvs/exch/lib/python3.6/site-packages/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance)
   2441             try:
-> 2442                 return self._engine.get_loc(key)
   2443             except KeyError:

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc (pandas/_libs/index.c:5280)()

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc (pandas/_libs/index.c:5126)()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item (pandas/_libs/hashtable.c:20523)()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item (pandas/_libs/hashtable.c:20477)()

KeyError: 1

During handling of the above exception, another exception occurred:

KeyError                                  Traceback (most recent call last)
~/source/poloniex/importer.py in <module>()
     14 cerebro.adddata(data)
     15 
---> 16 cerebro.run()
     17 cerebro.plot(style='bar')

~/.virtualenvs/exch/lib/python3.6/site-packages/backtrader/cerebro.py in run(self, **kwargs)
   1071             # let's skip process "spawning"
   1072             for iterstrat in iterstrats:
-> 1073                 runstrat = self.runstrategies(iterstrat)
   1074                 self.runstrats.append(runstrat)
   1075         else:

~/.virtualenvs/exch/lib/python3.6/site-packages/backtrader/cerebro.py in runstrategies(self, iterstrat, predata)
   1145                 if self._exactbars < 1:  # datas can be full length
   1146                     data.extend(size=self.params.lookahead)
-> 1147                 data._start()
   1148                 if self._dopreload:
   1149                     data.preload()

~/.virtualenvs/exch/lib/python3.6/site-packages/backtrader/feed.py in _start(self)
    201 
    202     def _start(self):
--> 203         self.start()
    204 
    205         if not self._started:

~/.virtualenvs/exch/lib/python3.6/site-packages/backtrader/feeds/pandafeed.py in start(self)
    205             if v is None:
    206                 continue  # special marker for datetime
--> 207             self._colmapping[k] = self.p.dataname.columns.get_loc(v)
    208 
    209     def _load(self):

~/.virtualenvs/exch/lib/python3.6/site-packages/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance)
   2442                 return self._engine.get_loc(key)
   2443             except KeyError:
-> 2444                 return self._engine.get_loc(self._maybe_cast_indexer(key))
   2445 
   2446         indexer = self.get_indexer([key], method=method, tolerance=tolerance)

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc (pandas/_libs/index.c:5280)()

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc (pandas/_libs/index.c:5126)()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item (pandas/_libs/hashtable.c:20523)()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item (pandas/_libs/hashtable.c:20477)()

KeyError: 1
> /Users/shinichi/source/poloniex/pandas/_libs/hashtable_class_helper.pxi(1218)pandas._libs.hashtable.PyObjectHashTable.get_item (pandas/_libs/hashtable.c:20477)()

ipdb> 

However, when I changed the code to look like this:

data = bt.feeds.PandasData(
    dataname=dataframe,
    datetime='date'
)

It still fails!

(exch) shinichi@ayanami ~/source/poloniex $ ipython --pdb importer.py
---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
~/source/poloniex/importer.py in <module>()
     14 cerebro.adddata(data)
     15 
---> 16 cerebro.run()
     17 cerebro.plot(style='bar')

~/.virtualenvs/exch/lib/python3.6/site-packages/backtrader/cerebro.py in run(self, **kwargs)
   1071             # let's skip process "spawning"
   1072             for iterstrat in iterstrats:
-> 1073                 runstrat = self.runstrategies(iterstrat)
   1074                 self.runstrats.append(runstrat)
   1075         else:

~/.virtualenvs/exch/lib/python3.6/site-packages/backtrader/cerebro.py in runstrategies(self, iterstrat, predata)
   1147                 data._start()
   1148                 if self._dopreload:
-> 1149                     data.preload()
   1150 
   1151         for stratcls, sargs, skwargs in iterstrat:

~/.virtualenvs/exch/lib/python3.6/site-packages/backtrader/feed.py in preload(self)
    433 
    434     def preload(self):
--> 435         while self.load():
    436             pass
    437 

~/.virtualenvs/exch/lib/python3.6/site-packages/backtrader/feed.py in load(self)
    474 
    475             if not self._fromstack(stash=True):
--> 476                 _loadret = self._load()
    477                 if not _loadret:  # no bar use force to make sure in exactbars
    478                     # the pointer is undone this covers especially (but not

~/.virtualenvs/exch/lib/python3.6/site-packages/backtrader/feeds/pandafeed.py in _load(self)
    235         else:
    236             # it's in a different column ... use standard column index
--> 237             tstamp = self.p.dataname.index[coldtime][self._idx]
    238 
    239         # convert to float via datetime and store it

IndexError: invalid index to scalar variable.

What's wrong with PandasData? So far the documentation isn't very clear, at one point I thought the standard procedure was to subclass bt.feeds.PandasData.