from tkinter import filedialog
import os

name = filedialog.askopenfilename(initialdir = "/", title = "Select file",
filetypes = (("py files", "*.py"), ("all files", "*.*")))
file_to_import = os.path.basename(os.path.splitext(name)[0])
import file_to_import

import file_to_import
ModuleNotFoundError: No module named 'file_to_import'