Relative path for OpenCV imread in python
main_image = cv2.imread('data/image.jpg')
img1 = os.path.join(os.path.dirname(__file__), 'images', 'main_image.jpg') main_image = cv2.imread(img1)
Tag: python
GUI automation in Python
import pyautogui
screenWidth, screenHeight = pyautogui.size()
currentMouseX, currentMouseY = pyautogui.position()
pyautogui.moveTo(100, 150)
pyautogui.click()
pyautogui.moveRel(None, 10) # move mouse 10 pixels down
pyautogui.doubleClick()
pyautogui.moveTo(500, 500, duration=2, tween=pyautogui.easeInOutQuad) # use tweening/easing function to move mouse over 2 seconds.
pyautogui.typewrite('Hello world!', interval=0.25) # type with quarter-second pause in between each key
pyautogui.press('esc')
pyautogui.keyDown('shift')
pyautogui.press(['left', 'left', 'left', 'left', 'left', 'left'])
pyautogui.keyUp('shift')
pyautogui.hotkey('ctrl', 'c')
References
https://pyautogui.readthedocs.io/en/latest/introduction.html
Get the height of Windows Taskbar using Python
To get the work area size (desktop minus taskbar):
from win32api import GetMonitorInfo, MonitorFromPoint
monitor_info = GetMonitorInfo(MonitorFromPoint((0,0)))
work_area = monitor_info.get("Work")
print("The work area size is {}x{}.".format(work_area[2], work_area[3]))
To get the taskbar height:
from win32api import GetMonitorInfo, MonitorFromPoint
monitor_info = GetMonitorInfo(MonitorFromPoint((0,0)))
monitor_area = monitor_info.get("Monitor")
work_area = monitor_info.get("Work")
print("The taskbar height is {}.".format(monitor_area[3]-work_area[3]))
Extract differences between two images using OpenCV in Python
import cv2
import numpy as np
img1 = cv2.imread("img1.png")
img2 = cv2.imread("img2.png")
diff = cv2.absdiff(img1, img2))
mask = cv2.cvtColor(diff, cv2.COLOR_BGR2GRAY)
th = 1
imask = mask>th
canvas = np.zeros_like(img2, np.uint8)
canvas[imask] = img2[imask]
cv2.imwrite("result.png", canvas)
References
https://stackoverflow.com/questions/27035672/cv-extract-differences-between-two-images
Take Screenshot on Windows Using Python
from PIL import ImageGrab
im = ImageGrab.grab()
im.save('screenshot.png')
Or
import win32gui, win32ui, win32con, win32api hwin = win32gui.GetDesktopWindow() width = win32api.GetSystemMetrics(win32con.SM_CXVIRTUALSCREEN) height = win32api.GetSystemMetrics(win32con.SM_CYVIRTUALSCREEN) left = win32api.GetSystemMetrics(win32con.SM_XVIRTUALSCREEN) top = win32api.GetSystemMetrics(win32con.SM_YVIRTUALSCREEN) hwindc = win32gui.GetWindowDC(hwin) srcdc = win32ui.CreateDCFromHandle(hwindc) memdc = srcdc.CreateCompatibleDC() bmp = win32ui.CreateBitmap() bmp.CreateCompatibleBitmap(srcdc, width, height) memdc.SelectObject(bmp) memdc.BitBlt((0, 0), (width, height), srcdc, (left, top), win32con.SRCCOPY) bmp.SaveBitmapFile(memdc, 'screenshot.bmp')
Don’t forget to SetProcessDPIAware if necessary
import ctypes user32 = ctypes.windll.user32 user32.SetProcessDPIAware()
References
https://stackoverflow.com/questions/4589206/python-windows-7-screenshot-without-pil
Get Screen Size in Python using Win32
import ctypes user32 = ctypes.windll.user32 user32.SetProcessDPIAware() screensize = user32.GetSystemMetrics(0), user32.GetSystemMetrics(1) print(screensize)
References
https://stackoverflow.com/questions/3129322/how-do-i-get-monitor-resolution-in-python
https://stackoverflow.com/questions/32541475/win32api-is-not-giving-the-correct-coordinates-with-getcursorpos-in-python
matplotlib font not found
When you add new fonts to your system, you need to delete your fontList.cache file in order for matplotlib to find them.
The file fontList.cache is located at your Userfolder –> .matplotlib/fontList.cache or ~/.cache/matplotlib/fontList.cache, for Windows that would normally be C:\Users\yourUsername\.matplotlib\fontList.cache
matplotlib.font_manager matplotlib.font_manager._rebuild()
References
https://stackoverflow.com/questions/26085867/matplotlib-font-not-found
http://andresabino.com/2015/08/18/fonts-and-matplotlib/
https://stackoverflow.com/questions/45877746/changing-fonts-in-matplotlib
Change ticks number on a plot in matplotlib
# Create your ticker object with M ticks M = 3 yticks = ticker.MaxNLocator(M) # Set the yaxis major locator using your ticker object. You can also choose the minor # tick positions with set_minor_locator. ax.yaxis.set_major_locator(yticks)
References
https://stackoverflow.com/questions/27425974/change-ticks-number-on-a-subplot
Removing white space around a saved image in matplotlib
plt.savefig("test.png",bbox_inches='tight')
References
https://stackoverflow.com/questions/11837979/removing-white-space-around-a-saved-image-in-matplotlib
Return images in flask response
from flask import send_file
@app.route('/get_image')
def get_image():
if request.args.get('type') == '1':
filename = 'ok.gif'
else:
filename = 'error.gif'
return send_file(filename, mimetype='image/gif')
References
https://stackoverflow.com/questions/8637153/how-to-return-images-in-flask-response
https://pythonprogramming.net/flask-send-file-tutorial/