在python中构建一个直方图，一列作为x轴，3列作为y轴

Question

I have the following data

method,RequirementT,RequirementN,RequirementU
1,1,7,0
2,0,0,8
3,2,6,0
4,1,7,0
5,2,6,0
6,2,6,0

Here is a link to my full data https://drive.google.com/file/d/1aBRy2uf34kjWQAo8nUDMnuAEHPR4XBMD/view?usp=sharing

I would like to built a histogram in python such that the x axis corresponds to the first column of my data (method) and the three other columns (RequirementT, RequirementN, RequirementU) are represented in the y axis. I would like the graph to be under the form of a histogram.

I have tried df.plot.bar(x='method', y=['RequirementT', 'RequirementN', 'RequirementU']) and this gives me the following output which is obviously wrong, completely non readable and I don't know why there is these thick black lines around the x axis

Answer 1

This works for me:

df.plot.bar(x='method', y=['RequirementT', 'RequirementN', 'RequirementU'])

Are you looking for a distribution plot? Try this:

import seaborn as sns
import matplotlib.pyplot as plt

df = df.set_index('method', drop=True)

sns.distplot(df.iloc[:, 0], bins=10) # just use .loc and insert your 3 columns instead of 0, 1, 2
sns.distplot(df.iloc[:, 1], bins=10)
sns.distplot(df.iloc[:, 2], bins=10)
plt.show()