以前我一直使用MATLAB绘制图形，但现在我正在学习python。我想在x-tick上平均组织酒吧。例如，在下面列出的问题中，我希望x-tick标签的每一侧都有两个条形。我将代码和我要制作的图放在这里。
此外，在学习python时，我希望获得有关代码的反馈（尽管我使用了在线教程的帮助）。我该如何做得更好？
import pandas as pd import matplotlib import matplotlib.pyplot as plt
import numpy as np
raw_data = {'Load': ['50', '100'], 'Diesel': [1.738, 1.689], 'D59O41':
[1.71, 1.649],'D74Eu26': [1.71, 1.649], 'D59T41': [1.748, 1.702]}
df = pd.DataFrame(raw_data, columns = ['Load', 'Diesel', 'D59O41',
'D74Eu26', 'D59T41']) df;
pos = (50,100)
n_groups = 2
# Setting the positions and width for the bars
index = np.arange(n_groups)
width = 10
r1 = pos
r2 = [x + width for x in r1]
r3 = [x + width for x in r2]
r4 = [x + width for x in r3]
# Plotting the bars
fig, ax = plt.subplots(figsize=(10,5))
plt.bar(r1, df['Diesel'], width, alpha=1, lw =1.8, edgecolor='black',
facecolor='black')
plt.bar(r2, df['D59O41'], width, alpha=1,lw =2,
edgecolor='black', facecolor='none')
plt.bar(r3, df['D74Eu26'], width, alpha=0.65,lw =2, edgecolor='red',
facecolor='red')
plt.bar(r4, df['D59T41'], width, alpha=0.65,lw =2, edgecolor='red',
facecolor='none')
# Set the y axis label
ax.set_ylabel('Fractal dimension')
# Set the x axis label
ax.set_xlabel('Load')
# Set the chart's title
ax.set_title('Test Figure')
# Set the position of the x ticks
ax.set_xticks([p*1.1 + width for p in pos])
# Set the labels for the x ticks
ax.set_xticklabels([50, 100])
# Setting the x-axis and y-axis limits
plt.xlim(min(pos)-width, max(pos)+width*6)
plt.ylim([0, 2.5])
# Adding the legend and showing the plot
plt.legend(['Diesel', 'D59O41', 'D74E26', 'D59T41'], loc='upper right')
plt.savefig('test_figure.tif', format='tif', dpi=300)
plt.show()