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_fileRepresentationMapping = {'.png': NSPNGFileType,'.gif': NSGIFFileType,'.jpg': NSJPEGFileType,'.jpeg': NSJPEGFileType,'.bmp': NSBMPFileType,'.tif': NSTIFFFileType,'.tiff': NSTIFFFileType,}def _getFileRepresentationType(filepath):	base, ext = os.path.splitext(filepath)	return _fileRepresentationMapping[ext.lower()]def screenshot(self, filepath):	# Take screenshot	rect = NSScreen.mainScreen().frame()    	image = NSImage.alloc().initWithSize_((rect.size.width, rect.size.height))	window = NSWindow.alloc().initWithContentRect_styleMask_backing_defer_(        				rect,             				NSBorderlessWindowMask,             				NSBackingStoreNonretained,             				False)	view = NSView.alloc().initWithFrame_(rect)	window.setLevel_(NSScreenSaverWindowLevel + 100)	window.setHasShadow_(False)	window.setAlphaValue_(0.0)	window.setContentView_(view)	window.orderFront_(self)	view.lockFocus()	screenRep= NSBitmapImageRep.alloc().initWithFocusedViewRect_(rect)	image.addRepresentation_(screenRep)	view.unlockFocus()	window.orderOut_(self)	window.close()	    	rect = NSScreen.mainScreen().frame()	image = NSImage.alloc().initWithSize_((rect.size.width, rect.size.height))	screenRep = NSBitmapImageRep.alloc().initWithFocusedViewRect_(rect)	image.addRepresentation_(screenRep)	# Save	representation = _getFileRepresentationType(filepath)	data = image_rep.representationUsingType_properties_(representation, None)	data.writeToFile_atomically_(filepath, False)