Python tkinter code doesn't run when inside a function

Your image is being garbage collected. This works.

import tkinter as tkfrom PIL import Image, ImageTkroot = tk.Tk()root.geometry("800x600")#store all images in this dict so garbage collection will leave them alone#it doesn't have to be named "images"; it just has to be a dictimages = dict()def display_rain(row=0, column=0):    #create and store the image if it doesn't exist    if 'rain_tk' not in images:        #unless you are making mips of this image you should probably          #~make it the proper size and get rid of the resize part        image = Image.open("./images/rain_jpeg.jpg").resize((250,250), Image.ANTIALIAS)        #you can add a name to reference the image by        #this makes it cleaner than accessing the dict directly        images['rain_tk'] = ImageTk.PhotoImage(image, name='rain')            #make and return the label, in case you want to grid_forget it or change the image    label = tk.Label(root, image='rain') #instead of image=images['rain_tk']    label.grid(row=row, column=column)    return label    #you can easily display this wherever you want by filling in the row and column arguments#as an example, this would be displayed at row1 column2rain_lbl = display_rain(1, 2)      root.mainloop()