width = surface.get_size()[0]
height = surface.get_size()[1]
import pygame
picture = pygame.image.load(filename)
picture = pygame.transform.scale(picture, (1280, 720))
image = pygame.image.load("path/to/file.png") # load image
width, height = image.get_width(), image.get_height() # get size
print(width, height) # print size
"""
OUTPUT:
(50, 50)
"""