How can I use the tab key as a input for four spaces?

[betapictoris]

Instead of having the tab key trigger autocomplete how could I instead use it to add four spaces to a multi-line input?

[erasels]

You can just create a keybind like so:

from prompt_toolkit.shortcuts import prompt
from prompt_toolkit.keys import Keys
import prompt_toolkit.buffer

kb = KeyBindings()

@kb.add(Keys.Tab)
def _(event):
    buff: prompt_toolkit.buffer.Buffer = event.app.current_buffer
    buff.insert_text("    ") 


prompt("Input: ", key_bindings=kb)

[betapictoris]

Thank you @erasels!