netgen/python/__main__.py

import imp, threading

def handle_arguments():
    import sys, __main__
    argv = sys.argv
    if len(argv)>1 and argv[1].endswith(".py"):
      with open(argv[1]) as pyfile:
          imp.load_module('__main__', pyfile, argv[1], (".py", "r", imp.PY_SOURCE))

def main():
    try:
        import ngsolve
    except:
        pass
    from .gui import win
    th = threading.Thread(target=handle_arguments)
    th.start()
    win.tk.mainloop()