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ROS turtlebot3 gazebo camera is black on openCV

When i run the following python script to show the turtlebot3 cam on an opencv window, the cam is black, however on rviz the camera seems to be working. import

Validation on lists in python

I am trying to add a feature to my code that will check to see if a tournament already exists. For a tournament to exist, basically means that there will be tea

I have this python trivia game that asks what type of trivia you want at the start, but if you want to play again it doesn't ask the question again

At the start it asks if you want NBA, MLB, or NFL trivia. Once it's done with the trivia, it asks if you want to play again, and if yes it gives the same type o

updateOne based on condition

await products.updateOne( { $and: [ { name: { $eq: name } }, { $expr: { $lt: ["$remaining", "$capacity"] } },

How can I get the registered service with the gRPC service class or function instead of in the Main() function

I have a gRPC service with several functions. To make it simple public GreeterService : GreeterServiceBase { public override Task<SayHelloResponse> Sa

Fontawsome PRO 6 Xamarin Forms

I have been trying to add these fonts into my xamarin project , but I don't know what Iam doing wrong. All I get is a question ( ? )icon . These are my steps Ed

Kendo ScatterChart now showing values

I have kendo scatter chart with 2 y-axis . I'm using kendo angular charts . When i try to bind my data i cannot see values and x-axis shows weird numbers instea