问如何在matplotlib barh绘图中更改宽度

EN

import os
import cx_Oracle
import matplotlib.pyplot as plt

r_c = [Sales_report_2020]
a_i =  [1311]

 
# Figure Size
fig, ax = plt.subplots(figsize =(12, 8))
#replace the None with integer 0
b = [0 if x is None else x for x in a_i]
print(b)
 
# Horizontal Bar Plot
plt.barh(r_c,b,height=0.5)
plt.ylim(-0.5, len(b) - 0.5)
ax.tick_params(width=0.5,length=6)
 

 
# Add annotation to bars
for i in ax.patches:
    plt.text(i.get_width()+0.2, i.get_y()+0.27,
            "{:1.0f}".format(i.get_width()),
             fontsize = 10, fontweight ='bold',
             color ='grey') #str(round((i.get_width()), 2))
 
# Add Plot Title
ax.set_title('DTP!',
             loc ='center', )
 
# Add Text watermark
fig.text(0.9, 0.15, 'STPREPORT', fontsize = 12,
         color ='grey', ha ='right', va ='bottom',
         alpha = 0.7)
 
 
path = r"\\ssd.COM\View\Folder_Redirect\id\Documents\Conda_Envs"
 
os.chdir(path)
plt.savefig(path + '\BAR.png')
 
# Show Plot
plt.show()
conn.close()