I figured yesterday that I spent a hell lot of time in SublimeText 3 to write import statements so searched a way to do that automatically.
Found the 10 years old plugin jasonmyers/PythonAutoImport plugin that do auto-imports.
Only thing is that it got tripped up by multilines import so I fixed that, added a gif screenshot and here is my fork : https://github.com/Kraymer/PythonAutoImport