How to create group or stack bar graph

matplotlib_bar graph_2.py

import ctypes
import tkinter
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2Tk


if __name__ == "__main__":
    ctypes.windll.shcore.SetProcessDpiAwareness(1)
    root = tkinter.Tk()
    
    #graph data
    x = np.arange(5)
    y_1 = [1, 5, 2, 9, 10]
    y_2 = [3, 1, 2, 6, 7]
    
    #create graph objects
    fig, ax = plt.subplots(ncols=2)

    #show graph
    width=0.3               #graph width
    ax[0].bar(x-width/2, y_1, width=width)  #shift to left
    ax[0].bar(x+width/2, y_2, width=width)  #shift to right
    
    ax[1].bar(x, y_1)
    ax[1].bar(x, y_2, bottom=y_1)   #height offset

    #set title
    fig.suptitle("bar graph")
    ax[0].set_title("group")
    ax[1].set_title("stack")

    plt.tight_layout()

    #set graph to tkinter window
    canvas = FigureCanvasTkAgg(fig, root)
    toolbar = NavigationToolbar2Tk(canvas, root)
    canvas.get_tk_widget().pack()           #show graph
    plt.close()

    root.mainloop()