for windows, in powershell

     (Invoke-WebRequest -UseBasicParsing "https://bootstrap.pypa.io/get-pip.py").Content | python -

but generally in that case, one doesn't need to install ensure_pip, and can use that. And one doesn't need to install pip at all, since it is an optional come-with

but in most cases, the `curl url | python -` or equivalent solves the problem