如何正确转换列表的输出值以将它们用作函数内的参数？

Question

I'm trying to write a script in python which searches the screen for a specific color in RGB, gets the pixel coordinates and then sends those to a click function to click on it. Here's my code so far:

from PIL import ImageGrab
import win32api, win32con

def click(x,y):
    win32api.SetCursorPos((x,y))
    win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x,y,0,0)
    win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP,x,y,0,0)

color = (10,196,182)
session = False
match = False

while(True):
    screen = ImageGrab.grab()
    found_pixels = []
    for i, pixel in enumerate(screen.getdata()):
        if pixel == color:
            match = True
            found_pixels.append(i)
            break
    else:
        match = False

    width, height = screen.size
    found_pixels_coords = [divmod(index, width) for index in found_pixels]

    if session == False and match == True:
        click(found_pixels_coords)
        print("Match_Found")
        session = True
    if session == True and match == False:
        session = False

How can I convert the output of founds_pixels_coords to use it inside the click(x,y) function? I'm also getting the output values reversed, (y,x) instead of (x,y) , which I don't understand why.

Here's my console output, in case I'm totally wrong:

Traceback (most recent call last):
  File "test2.py", line 28, in <module>
    click(found_pixels_coords)
TypeError: click() missing 1 required positional argument: 'y'

EDIT: click(*found_pixels_coords[0]) as suggested by @martineau seems to solve the missing argument error. I also got around the reversed values by defining click(y,x) . Any proper solution to this however, would be greatly appreciated.

Answer 1

Since found_pixels_coords is a list (although it will never contain more than one set of coordindates), here's how to use the one set in it (if any matched):

    .
    .
    .
    if session == False and match == True:
        click(*found_pixels_coords[0]) # <== Do it like this.
        print("Match_Found")
        session = True
    if session == True and match == False:
        session = False
    .
    .
    .

Answer 2

Just call click() like this (add a * before the list name to unpack the values).

click(*found_pixels_coords)  # Make sure list contains 2 values

If you are not sure about number of items in found_pixels_coords list then just change the signature of click() function from

def click(x, y):

to

def click(x, y, *args):

In this case, if there will be more than 2 values in list, no problem, 3 to onwards will be in args tuple.

Answer 3

As you say that the order of the coordinates is inverted, we can use two auxiliary variables to unpack the values and then pass them in the required order:

y, x = found_pixels_coords
click(x, y)

If found_pixels_coords is a list with several coordinates, then you can pick the first one with:

y, x = found_pixels_coords[0]
click(x, y)