[Python / pyGame] Rotate image towards mouse pointer

Oh great internetmenz, I need your help. My decade old math skills are failing me.

I'm attempting to rotate an image towards a point using pygame. The point is the mouse cursor in this case. Here is an example of my issue (this is only a snippet):


src_image, rect = pygame.image.load('c:\\testimage.png')
screen = pygame.display.get_surface()

# Example values
player_angle = 0
player_position = (100,100)

# Get the mouse point (Something between (0,0) and (1024,800)).
mouse_point = pygame.mouse.get_pos()

# Set the old_center for repositioning after the rotate.
old_center = self.rect.center

# *** Heres my problem, how do I determine what the angle is from the player_angle
# to the mouse_point with only these three peices of information.
angle_to_mouse = ??

image = pygame.transform.rotate(self.src_image, angle_to_mouse)
rect = image.get_rect()
rect.center = old_center




How do I determine the angle from the center point of the player_point to the mouse_point?

Thanks!