[Tutor] Fastest way to iterate through a file

[elis aeris]

I found out that by making a copy of it, it can be load()  ed !


it runs 3 times faster now














import time

import ImageGrab
from ctypes import *


class RECT(Structure):
  _fields_ = [
    ('left', c_ulong),
    ('top', c_ulong),
    ('right', c_ulong),
    ('bottom', c_ulong)
    ]

GetForegroundWindow = windll.user32.GetForegroundWindow
GetWindowRect = windll.user32.GetWindowRect


rect = RECT()
foreground_window = GetForegroundWindow()
GetWindowRect(foreground_window, byref(rect))
image = ImageGrab.grab((rect.left, rect.top, rect.right, rect.bottom))

start_time = time.time()
num_pixels = 0
num_black = 0

pix = image.copy().load()


print time.time()

for x in xrange(200):
  for y in xrange(200):
    num_pixels += 1
    if pix[x, y] == (0, 0, 0):
        num_black += 1
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