[Python] Open Vim with text in it, without saving the file

I want to write a script which ends by calling my text editor (vim) on a specific file path. The file doesn't yet exist, and I want the editor window to already have some contents in it. In particular, I want that:

1. 
   If I save the file contents in my text editor w in vim), then the contents of the file are saved at the specified path.
   
   
2. 
   If I quit the text editor without saving the contents q! in vim), then the contents of the file are not saved.
   

If I just do something like:

with open(filename, "x") as file:
file.write("something long and complicated")
subprocess.call(["vim", filename])


then point (1) works but point (2) doesn't — if I quit vim without saving, the file was still created. Essentially I want it to be like I called vim filename and then added a bunch of stuff in the editor window.

What's the best way of achieving this?

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