close Matplotlib figure in each iteration

Question

I have a loop and need to show a figure in each iteration, I need to close the figure completely and after a while show another figure. This is my code:

 for j in range (3):
   img = mpimg.imread("E" + str(j) + ".jpg")
   imgplot = plt.imshow(img)
   plt.show(block=False)
   plt.pause(3)
   plt.close()

Here it seems that each figure will replace with another figure although I need the code to close the first figure completely, do some operations and then show another figure.I even used plt.close("all") but it didn't work.
Any help would be appreciated.

Answer 1

I don't understand what you exactly expect, but adding plt.pause(1) can have a similar result.

If your plt backend is Qt (you can check it via plt.get_backend() ), for absolute positioning of the figures, please use plt.get_current_fig_manager().window.setGeometry(x0,y0,width,height) function. Additionally, if you want some operations to control the opening and closing figures, inserting while loop with keyboard input can be a simple soultion.

%matplotlib qt # Only if you are using Jupyter


import keyboard
import time

def keyboard_block(key):
    while(True):
        time.sleep(1.0)
        key_input = keyboard.read_key()
        if key_input == key:
            break
        else:
            print(key_input)

for j in range (3):
   img = mpimg.imread("E" + str(j) + ".jpg")
   imgplot = plt.imshow(img)
   plt.get_current_fig_manager().window.setGeometry(600,400,400,400)
   plt.show(block=False)
   plt.pause(3)
   keyboard_block(key='a') # wait before closing
   plt.close()
   keyboard_block(key='a') # wait before opening a new one

In this code, the first figure posp up for 3 seconds and it will close in 1 second. Then the second one pops up.