How to put value over bars when creating many barplots with a loop

Question

How can I put the value over the bars when creating many plots with a loop.

The code I am using

years = [twenty,twentyone,twentytwo,twentythree]

for year in years:

   plt.ylim(0, 60)
   ax = sns.barplot(data=year, errorbar=None)
   ax.set_xticklabels(ax.get_xticklabels(), rotation=45, horizontalalignment='right')
   for i in ax.containers:
       ax.bar_label(i,)
   
   
   plt.xlabel('Type of error')
   
   
   # Set plot title and save image
   if year is twenty:
       plt.title('2020')
       plt.savefig(f'barplot_2020.png',bbox_inches="tight")


   
   elif year is twentyone:
       plt.title('2021')
       plt.savefig(f'barplot_2021.png',bbox_inches="tight")
       
   
   elif year is twentytwo:
       plt.title('2022')
       plt.savefig(f'barplot_2022.png',bbox_inches="tight")
   
   elif year is twentythree:
       plt.title('2023')
       plt.savefig(f'barplot_2023.png',bbox_inches="tight")
       #ax.bar_label(ax.containers[0],fmt="%.1f")

I have tried also to put some code in the ifs as shown in the last elif but the result is always the same as shown below.

Answer 1

This is because you're missing a plt.figure() command in the beginning of your loop.

plt.figure() instructs matplotlib to create a new empty figure. Currently you're constantly modifying the same figure, thus the bars overwrite each other.

We can fix this:

import seaborn as sns
import matplotlib.pyplot as plt

twenty = {'Type of error': ['A', 'B', 'C'], 'Count': [25, 35, 42]}
twentyone = {'Type of error': ['A', 'B', 'C'], 'Count': [30, 40, 38]}
twentytwo = {'Type of error': ['A', 'B', 'C'], 'Count': [28, 33, 45]}
twentythree = {'Type of error': ['A', 'B', 'C'], 'Count': [32, 38, 40]}

years = [twenty, twentyone, twentytwo, twentythree]

for year, data in zip(range(2020, 2024), years):
    plt.figure()  
    
    plt.ylim(0, 60)
    ax = sns.barplot(data=data, x='Type of error', y='Count', errorbar=None)
    ax.set_xticklabels(ax.get_xticklabels(), rotation=45, horizontalalignment='right')
    
    for p in ax.patches:
        ax.bar_label(ax.containers[0], fmt="%.1f")
    
    plt.xlabel('Type of error')
    plt.title(str(year))
    plt.show()