Given a function name (string), and a path to a Python script (string), import the function from the script.

import_from_file.py

import os
import sys
import importlib.util
from typing import Callable

def import_from_file(script_path: str, function_name: str) -> Callable:
  """
  Imports a function from a Python script file given the file path and the function name.
  
  Args:
      script_path (str): The file path of the Python script.
      function_name (str): The name of the function to import from the script.

  Returns:
      function (Callable): The function handle for the specified function name.

  Raises:
      FileNotFoundError: If the script file does not exist.
      AttributeError: If the function with the given name does not exist in the script.
      ImportError: If there is an error in importing the module.
  """
  # Get the module name from the script path
  module_name = os.path.splitext(os.path.basename(script_path))[0]
    
  # Load the module from the given script path
  spec = importlib.util.spec_from_file_location(module_name, script_path)
  module = importlib.util.module_from_spec(spec)
  sys.modules[module_name] = module
  spec.loader.exec_module(module)
    
  # Get the function from the loaded module
  function = getattr(module, function_name)
    
  return function