Python: Funcion para crear un numero de identidad basado en la fecha

 
from datetime import datetime

def create_id(prefix = "test"):
    '''creates id with a prefix chosen by user'''
    thisday = datetime.now()
    return prefix+str(thisday.year)+str(thisday.month)+str(thisday.year)+ str(thisday.hour)+str(thisday.minute)+str(thisday.second)
    
if __name__ == "__main__":
    new_id = create_id("RUBEN")
    print new_id