Toggle nerd tree: / + n
To open a file in the nerd tree in split window: s
Switch screen: ctrl + ww
To run the script without quitting VI: :! python name.py
Visualization mode to cut, copy, paste etc.
shift + v
Cut/delete: x
Copy: y
Paste: p
Indents
To indent right "number" times: number shift >
To indent left "number" times: <
Undo
u
Quit all without saving
qa!
To open multiple files in split windows
vi name1.py name2.py -O