Python Matplotlib : plot text will not align left

我正在尝试获取红点的值(对于“y2”的值)绘制到点的左侧。我正在使用 ha='left' 但无济于事。我尝试了以下两种方法:

for a,b in zip(ind, y2): 
    plt.text(a, b, str(b), fontsize=14, color='black', va='center', ha='left) 
 
#OR: 
for i, text in enumerate(y2): 
    ax.annotate(str(text), (ind[i],y2[i]), ha='left') 

完整代码如下:

import pandas as pd 
import numpy as np 
from matplotlib import pyplot as plt 
%matplotlib inline 
df0=pd.read_csv('sample1.csv') 
 
import matplotlib.pyplot as plt 
 
# You typically want your plot to be ~1.33x wider than tall. 
# Common sizes: (10, 7.5) and (12, 9) 
fig, ax = plt.subplots(1, 1, figsize=(12, 9)) 
plt.xticks(ind, x_axis, fontsize=14) 
#Set y-axis font size 
plt.yticks(fontsize=12) 
x_axis = ['a','b','c'] 
y_axis = [2,8,10] 
 
y2 = [3, 5, 9.5] 
 
# Remove the plot frame lines. They are unnecessary here. 
ax.spines['top'].set_visible(False) 
ax.spines['bottom'].set_visible(False) 
ax.spines['right'].set_visible(False) 
ax.spines['left'].set_visible(False) 
 
#0 = 'a', 1 = 'b, 2 = 'c' 
ind = np.arange(len(x_axis)) 
 
 
#remove axis ticks save for left (y-axis): 
plt.tick_params( 
    axis='x',          # changes apply to the x-axis 
    which='both',      # both major and minor ticks are affected 
    bottom='off',      # ticks along the bottom edge are off 
    top='off')         # ticks along the top edge are off 
 
 
plt.tick_params( 
    axis='y',          # changes apply to the x-axis 
    which='both',      # both major and minor ticks are affected 
    right='off') 
 
plt.title('Super Awesome Title Goes Here\n' 
          'and Is Continued Here', fontsize=18, va='center') 
#Plot dots, cyan circles, no edges, transparency = 0.7 (1 is opaque)) 
# larger circles 
plt.plot(ind, y_axis, 'co', markeredgecolor='none', alpha=1, markersize=40) 
#plt.axis(0,10,0,3) 
 
plt.plot(ind, y2, 'ro', markeredgecolor='none', alpha=.7, markersize=40) 
 
#a and b are "where" to plot the label, str(b) is what to plot for the label 
#add spaces to put label to the right 
for a,b in zip(ind, y_axis): 
    plt.text(a, b, "     "+str(b), fontsize=14, color='black', va='center') 
 
for a,b in zip(ind, y2): 
    plt.text(a, b, str(b), fontsize=14, color='black', va='center', ha='left') 
 
    #Cell padding between categories 
plt.xlim([min(ind) - 0.25, max(ind) + 0.25]) 
plt.ylim([0, max(y_axis) + 2]) 
plt.show() 

请您参考如下方法:

ha 和 va 参数指定文本边界框的哪些边缘将与指定的 x,y 坐标对齐。如果您希望文本显示在点的左侧，您需要根据边界框的右侧边缘对齐它:

from matplotlib import pyplot as  plt 
 
fig, ax = plt.subplots(1, 1) 
ax.hold(True) 
ax.plot(0, 0, '+', ms=60) 
ax.text(0, 0, 'align by top right corner', ha='right', va='top', fontsize=22) 
ax.text(0, 0, 'align by bottom left corner', ha='left', va='bottom', fontsize=22) 
ax.set_axis_off() 
plt.show()