Add value labels to the bars in a bar chart

label_bar.py

import pandas as pd
import matplotlib as mpl

def label_bar(
  s: pd.Series,
  horizontal: bool = False,
  **kwargs
) -> mpl.axes.Axes:
    """Creates a Matplotlib bar chart with values in the bars
    from a Pandas Series."""
    
    if horizontal:
        ax = s.plot.barh(**kwargs)
        offset = ax.get_ylim()[1] / 10
    else:
        ax = s.plot.bar(**kwargs)
        offset = ax.get_xlim()[1] / 10
    
    rects = ax.patches
    
    for rect in rects:
        
        height = rect.get_height()
        width = rect.get_width()
        x = rect.get_x()
        y = rect.get_y()
        
        if horizontal:
            label = str(width)
            ax.text(width + offset, y + height/2, label, ha='left', va='center')
        else:
            label = str(height)
            ax.text(x + width/2, height + offset, label, ha='center', va='bottom')
    
    return ax

# Example
ax = df['column_1'].value_counts().pipe(label_bar, horizontal=True, figsize=(12, 9))