Here is an example of trying to load a nonexistent image from disk: $ python Īnytime you try to access an attribute of a None image loaded from disk via cv2.imread you’ll get a NoneType error. Instead, cv2.imread will simply return None. The cv2.imread function does not explicitly throw an error message if you give it an invalid file path (i.e., a path to a nonexistent file).
SIMPLEIMAGE OBJECT HAS NO ATTRIBUTE CODE
If you are receiving a NoneType error and your code is calling cv2.imread, then the likely cause of the error is an invalid file path supplied to cv2.imread. I have provided details for each of the cases below. In my experience, over 95% of the time these NoneType errors can be traced back to either an issue with cv2.imread or cv2.VideoCapture. When using OpenCV and Python bindings, you’re bound to come across NoneType errors at some point. Two reasons for 95% of OpenCV NoneType errors I then try to set the bar attribute of foo to True, but since foo is a NoneType object, Python will not allow this - hence the error message. Here I create a variable named foo and set it to None. Here is an example of generating a NoneType error from the Python shell: > foo = NoneĪttributeError: 'NoneType' object has no attribute 'bar' Īs the name suggests, None represents the absence of a value, such as when a function call returns an unexpected result or fails entirely.
We see these errors when we think we are working with an instance of a particular Class or Object, but in reality we have the Python built-in type None. Where something can be replaced by whatever the name of the actual attribute is. When using the Python programming language you’ll inevitably run into an error that looks like this: AttributeError: 'NoneType' object has no attribute ‘something’ I’ll then discuss the two primary reasons you’ll run into NoneType errors when using OpenCV and Python together.įinally, I’ll put together an actual example that not only causes a NoneType error, but also resolves it as well. In the first part of this blog post I’ll discuss exactly what NoneType errors are in the Python programming language. Var imageData = Convert.ToBase64String(File.ReadAllBytes(imagePath)) ĬontentUrl = $"data:image/png base64,",īots/attachments_bot.Looking for the source code to this post? Jump Right To The Downloads Section OpenCV: Resolving NoneType errors Var imagePath = Path.Combine(Environment.CurrentDirectory, "architecture-resize.png") Next, we look at the types of attachments. Reply = MessageFactory.Text("This is an inline attachment.") The code below is setting up the reply for an inline attachment: Assigning the attachments to the reply is the same for each attachment type, however the various attachments are set up and defined differently, as seen in the following snippets. To create the reply message, define the text and then set up the attachments. To add a media attachment to a message, create an Attachment object for the reply activity and set the ContentType, ContentUrl, and Name properties.
The Attachments property of the Activity object contains an array of Attachment objects that represent the media attachments and rich cards attached to the message. All of the source code shown in this section is based on the Handling attachments sample.
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