我是 python 新手，有人帮我处理这段代码，但我想更改一些参数：
首先是图例的大小，有些时候图例很大（例如：D_0__Bacteria;D_1__Firmicutes;D_2__Clostridia;D_3__Clostridiales;D_4__Peptostreptococcaceae;D_5__Acetoanaerobium），有些时候它很短（Acetoanaerobium），所以我只想制作图例自动修复大小（图中图例不完整）！！！。
二、当指针悬停在bar的区域时出现的标签，显示对应的数据的名称和值，(hover.tooltips = [('Taxon','example: Acetoanaerobium'),('Value ','对应值示例：99')])
第三：情节（图）的位置，在中间
#!/usr/bin/env python
import pandas as pd
from bokeh.io import show, output_file
from bokeh.models import ColumnDataSource
from bokeh.plotting import figure
from bokeh.core.properties import value
from bokeh.palettes import Spectral
from bokeh.models import HoverTool
#from bokeh.plotting import figure, output_file, show, ColumnDataSource
import itertools
import sys
data_in = sys.argv[1]
data_out = sys.argv[2]
output_file(data_out + ".html")
df = pd.read_csv(data_in, sep='\t')
df.set_index('#OTU_ID', inplace=True)
#print(df)
s_data = df.columns.values # linia de samples !!!
t_data = df.index.values #columna de datos
#print(s_data)
#print(t_data)
# You have two rows with 'uncultured' data. I added these together.
# This may or may not be what you want.
df = df.groupby('#OTU_ID')[s_data].transform('sum')
#grouped = df.groupby(["columnA", "columnB"], as_index=False).count()
#print(grouped)
# create a color iterator
# See https://stackoverflow.com/q/39839409/50065
# choose an appropriate pallete from
# https://docs.bokeh.org/en/latest/docs/reference/palettes.html
# if you have a large number of organisms
color_iter = itertools.cycle(Spectral[5])
colors = [next(color_iter) for organism in t_data]
# create a ColumnDataSource
data = {'xs': list(s_data)}
for organism in t_data:
data[organism] = list(df.loc[organism])
source = ColumnDataSource(data=data)
#print(organism)
# create our plot
plotX = figure(x_range=s_data, plot_height=500, title="Relative Abundance",
toolbar_location=None, tools="hover")
plotX.vbar_stack(t_data, x='xs', width=0.93, source=source,
legend=[value(x) for x in t_data], color=colors)
plotX.xaxis.axis_label = 'Sample'
plotX.yaxis.axis_label = 'Percent (%)'
plotX.legend.location = "bottom_left"
plotX.legend.orientation = "vertical"
# Position the legend outside the plot area
# https://stackoverflow.com/questions/48240867/how-can-i-make-legend-outside-plot-area-with-stacked-bar
new_legend = plotX.legend[0]
plotX.legend[0].plot = None
plotX.add_layout(new_legend, 'below')
hover = plotX.select(dict(type=HoverTool))
hover.tooltips = [('Taxon','unknow_var'),('Value','unknow_var')]
# I don't know what variable to addd in unknow_var
show(plotX)
in 文件是一个 file.txt，制表符分隔的文件，如：
#OTU_ID columnA columnB columnC columnD columnN
D_0__Bacteria;D_1__Actinobacteria;D_2__Acidimicrobiia;D_3__Acidimicrobiales;D_4__uncultured;D_5__uncultured_bacterium 1 3 7 0.9 2
D_0__Bacteria;D_1__Acidobacteria;D_2__Subgroup_25;D_3__uncultured_Acidobacteria_bacterium;D_0__Bacteria;D_1__Actinobacteria;D_2__Actinobacteria;D_3__Streptomycetales;D_4__Streptomycetaceae;D_5__Kitasatospora 5 3 13 7 5
D_0__Bacteria;D_1__Firmicutes;D_2__Bacilli;D_3__Bacillales;D_4__Bacillaceae;D_5__Anoxybacillus 0.1 0.8 7 1 0.4
D_0__Bacteria;D_1__Firmicutes;D_2__Bacilli;D_3__Lactobacillales;D_4__Carnobacteriaceae;D_5__Carnobacterium 3 7 9 16 11
D_0__Bacteria;D_1__Firmicutes;D_2__Bacilli;D_3__Bacillales;D_4__Bacillaceae;D_5__Oceanobacillus 5 2 15 1 7
D_0__Bacteria;D_1__Firmicutes;D_2__Clostridia;D_3__Clostridiales;D_4__Family_XII;D_5__Fusibacter 8 9 0 11 22
D_0__Bacteria;D_1__Firmicutes;D_2__Clostridia;D_3__Clostridiales;D_4__Peptostreptococcaceae;D_5__Acetoanaerobium 99 3 12 1 3
D_4__Clostridiaceae_2;D_5__Alkaliphilus 33 45 1 0 9
D_4__Peptococcaceae;D_5__uncultured 0 3 9 10 11
在此示例中，值不是 y 图例中所说的 %，这些值只是一个示例！！！
非常感谢 ！！！