To animate a rotating image in a Tkinter canvas in Python, we can use the `create_image()` method of the canvas to create an image object and then use the `after()` method to repeatedly call a function that rotates the image by a certain angle and updates its position on the canvas [3].

Here's an example code snippet that animates a rotating image in a Tkinter canvas without using a class:

import tkinter as tk
from PIL import Image, ImageTk

def rotate_image(canvas, image, angle, x, y):
    # Rotate the image by the given angle
    rotated_image = image.rotate(angle)

    # Convert the rotated image to a PhotoImage object
    rotated_photo = ImageTk.PhotoImage(rotated_image)

    # Update the canvas image object with the rotated image
    canvas.itemconfig(canvas_image, image=rotated_photo)

    # Update the position of the canvas image object
    canvas.coords(canvas_image, x, y)

    # Schedule the next rotation after a delay
    canvas.after(50, rotate_image, canvas, image, angle+5, x, y)

# Create a Tkinter window and canvas
root = tk.Tk()
canvas = tk.Canvas(root, width=400, height=400)
canvas.pack()

# Load the image and create a PhotoImage object
image = Image.open("image.png")
photo = ImageTk.PhotoImage(image)

# Create the canvas image object with the PhotoImage
canvas_image = canvas.create_image(200, 200, image=photo)

# Start the rotation animation
rotate_image(canvas, image, 0, 200, 200)

# Start the Tkinter event loop
root.mainloop()

This program first creates a Tkinter window and canvas. It then loads an image and creates a PhotoImage object from it. It creates a canvas image object with the PhotoImage and starts the rotation animation by calling the `rotate_image()` function with the canvas, image, initial angle, and initial position. The `rotate_image()` function rotates the image by the given angle, updates the canvas image object with the rotated image, and schedules the next rotation after a delay using the `after()` method. Finally, the program starts the Tkinter event loop to display the window and canvas.

Note that the `after()` method schedules a function to be called after a certain delay in milliseconds. In this example, the delay is set to 50 milliseconds, which means that the `rotate_image()` function will be called approximately 20 times per second. You can adjust the delay to change the speed of the animation.