Question was answered in following stackoverflow post:
What does the $ mean when running commands?
What does the $ mean when running commands?
As of now, Python does not implement $ in its syntax. So, it has nothing to do with Python.
Instead, what you are seeing is the terminal prompt of a Unix-based system (Mac, Linux, etc.)
So basically is terminal prompt and you should type in only: python test1.py without $ sign. another example is ~ when using oh-my-zsh.
