Seemingly perfect code written on TextWrangler gives SyntaxError when run on Python 3

Question

This is my code:

def trip(nights):
    return 140 * nights

def plane_cost(ride):
    if ride == "London":
        return 220
    elif ride == "Rome":
        return 200
    elif ride == "Glascow":
        return 185

def car_rental(days):
    cost = 20 * days
    if days >= 7:
        cost = cost - 25
    if days >= 3:
        cost = cost - 10
    return cost

def tripcost(ride, days, spending_pounds):
    trip(days) + plane_cost(ride) + car_rental(days) + spending_pounds

print ("London", 5, 500)

Was wondering why the word tripcost (marked in bold) was shown to be a syntax error when I loaded it in idlE?

Answer 1

尝试from __future__ import print_function添加脚本的开头，并更改print(tripcost("London", 5, 500)) print tripcost("London", 5, 500)上的print(tripcost("London", 5, 500))