generate_bar_graph.py

def generate_bar_graph(df, title):
    """
    This function creates a bar graph from pandas dataframe columns.
    Arguments:
        df: Pandas dataframe. Index will be x-axis. Categories and 
        associated amounts are from columns
        title: String. Name of the bar graph
    Outputs:
        Bar graph in console.
    """
    df.plot.bar(rot=0)
    plt.title(title, color='black')
    plt.legend(loc='center left', bbox_to_anchor=(1.0, 0.5))
    plt.show()

...
#Execution in main script
generate_bar_graph(vendor_data_stacked_bar_graph_pivoted, 
                       title='Number of Times Vendor Was Purchased From Over Quarter')