Looks like you don't even need to call getch()
as this is sufficient:
import curses
import curses.textpad as textpad
def main(screen):
"""screen is a curses screen passed from the wrapper"""
while True:
textpad.Textbox(curses.newwin(1,13,4,0), insert_mode=True).edit()
textpad.Textbox(curses.newwin(1,13,4,16), insert_mode=True).edit()
if __name__ == '__main__':
curses.wrapper(main)