在matplotlib中连接两个Sankey图

我正在尝试使用 matplotlib 表示一个国家的天然气平衡.

I'm trying to represent a country's gas balance using matplotlib.

我的想法是，我想使用一个Sankey绘制三​​种进口天然气源，并将其连接到另一个Sankey，Sankey具有其他天然气源(生产，储气库)和天然气消耗者.

The idea is that there are three sources of imported gas which I want to plot using one Sankey and connect it to another Sankey which has other sources of gas (production, gas storages) and gas consumers as outflows.

我尝试了很多次，但是我无法将两个图形连接在一起.

I tried it many times but I cannot connect two graphs together.

每个图都按设计单独绘制.但是，一旦我添加"prior = 0，connect =(3,0)" (据称将两个图连接在一起)，一切都会出错，这给了我我无法完全理解的错误.这是代码.

Each of the graphs separately plots as designed. But as soon as I add "prior=0, connect=(3,0)" which supposedly connects two graphs together everything goes awry giving me errors which I cannot fully understand. Here is the code.

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.sankey import Sankey


ImportLabels=["Imports by\nNaftogaz","Imports by\nOstchem","Imports from\nEurope", ""]
ImportFlows=[11.493,9.768,1.935,-23.196]
ImportOrientation=[0,1,-1,0]

l=["Imports","Private\nextraction","State\nextraction","Net supplies\ntoUGS","Households","TKE","Metallurgy","Energy","Other\nIndustries","Technological\nlosses"]
v=[23.196,3.968,13.998,-2.252,-13.289,-7.163,-3.487,-4.72,-7.037,-3.17]
d=[0,-1,1,-1,0,0,1,1,1,-1]

sankey=Sankey(scale=1.0/69,patchlabel="Gas balance",format='%.1f',margin=0.15)
sankey.add(flows=ImportFlows, labels=ImportLabels, orientations=ImportOrientation, label='Imports',fc='#00AF00')
sankey.add(flows=v,labels=l,orientations=d, prior=0, connect=(3,0),label='Second',fc='#008000')

想法是将第一个图的 3 个流出(具有 -23.196 的值)与第二个 sankey 的 0 个流入(也具有 23.196)连接起来

The idea is to connect 3 outflow from first graph (which has -23.196 value) with 0 inflow of the second sankey (which also has 23.196)

这是错误文本:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-24-1220fede42ce> in <module>()
     14 sankey=Sankey(scale=1.0/69,patchlabel="Gas balance",format='%.1f',margin=0.15)
     15 sankey.add(flows=ImportFlows, labels=ImportLabels,  orientations=ImportOrientation, label='Imports',fc='#00AF00')
---> 16 sankey.add(flows=v,labels=l,orientations=d, prior=0, connect=(3,0),label='Second',fc='#008000')

C:\Python27\lib\site-packages\matplotlib\sankey.pyc in add(self, patchlabel, flows, orientations, labels, trunklength, pathlengths, prior, connect, rotation, **kwargs)
    369                    ("The connection index to the source diagram is %d, but "
    370                     "that diagram has only %d flows.\nThe index is zero-based."
--> 371                     % connect[0], len(self.diagrams[prior].flows))
    372             assert connect[1] < n, ("The connection index to this diagram is "
    373                                     "%d, but this diagram has only %d flows.\n"

TypeError: not enough arguments for format string

所以我不确定两个图形之间的连接是否有问题(由sankey.pyc试图显示的文本建议)还是matplotlib本身有问题，如"TypeError:没有足够的参数用于格式字符串"表示?

So I'm not sure Is it problem with connection between two graphs (suggested by the text the sankey.pyc is trying to display) or is it something wrong with matplotlib itself as "TypeError: not enough arguments for format string" indicates?