To post this question and this question, I had to copy the contents of minibuffer.

I tried to copy from minibuffer but it didn't worked.

I came across this discussion and checked *Messages* buffer also. But minibuffer contents won't be there always.

Is it possible to copy mini buffer contents? How?

Update:

I am in a python process buffer and run kill-this-buffer, emacs will show this message in minibuffer

Buffer "Python" has a running process; kill it (y or n)?

I want to copy that text.