I just use a combination of print statements and pdb for debugging, I don't trust automatic re-factoring for Python though, so I tend to do them manually with regex.
What really helps vim beat PyCharm/IntelliJ for me is the fact that I work with a lot of C code as well as Python. IntelliJ's C support sadly isn't quite there yet.
Jedi is really awesome for autocomplete: https://github.com/davidhalter/jedi-vim
This plugin really helps in formatting code: https://github.com/hynek/vim-python-pep8-indent
There's another plugin that helps with PEP8 linting: https://github.com/nvie/vim-flake8
I just use a combination of print statements and pdb for debugging, I don't trust automatic re-factoring for Python though, so I tend to do them manually with regex.
What really helps vim beat PyCharm/IntelliJ for me is the fact that I work with a lot of C code as well as Python. IntelliJ's C support sadly isn't quite there yet.