How can I create and open a file from terminal with a single command?

Question

To create a file from terminal I type the following...

$ touch filename.py

To open the file I just created from terminal, I then type...

Answer 1

To create a file from terminal I type the following... $ touch filename.py but not able to create the file

To open the file I just created from terminal, I then type... $ open filename.py but not able to open the file