main.py

from tkinter import *
from matplotlib.figure import Figure
from matplotlib.backends.backend_tkagg import (FigureCanvasTkAgg, NavigationToolbar2Tk)


# plot function is created for
# plotting the graph in
# tkinter window..
def plot():
    # the figure that will contain the plot
    fig = Figure(figsize=(5, 5), dpi=100)

    # list of squares
    y = [i ** 2 for i in range(101)]

    # adding the subplot
    plot1 = fig.add_subplot(111)

    # plotting the graph
    plot1.plot(y)

    # creating the Tkinter canvas
    # containing the Matplotlib figure
    canvas = FigureCanvasTkAgg(fig, master=window)
    canvas.draw()

    # placing the canvas on the Tkinter window
    canvas.get_tk_widget().pack()

    # creating the Matplotlib toolbar
    toolbar = NavigationToolbar2Tk(canvas, window)
    toolbar.update()

    # placing the toolbar on the Tkinter window
    canvas.get_tk_widget().pack()


# the main Tkinter window
window = Tk()

# setting the title
window.title('Plotting in Tkinter')

# dimensions of the main window
window.geometry("500x500")

# button that displays the plot
plot_button = Button(master=window,
                     command=plot,
                     height=2,
                     width=10,
                     text="Plot")

# place the button
# in main window
plot_button.pack()

# run the gui
window.mainloop()