How to give return value of a function to print in Python

Question

I am very new to python and I am trying to write a simple vacation program. In my program, the user is required to input city, number of days of vacation etc... and in the end I calculate the total cost, based on some simple calculations defined in few functions.

My problem is, I am not able to print the output of a particular function which has two input parameters, without adding the input parameters in the print statement !!!

But, since the user enters the values, I don't want to hardcode them.

def trip_cost(city, days,spending_money): 
  city = hotel_cost(days) + plane_ride_cost(city) 
  days = rental_car_cost(days) 
  total_cost = city + days + spending_money 
  return total_cost

I am new and lost !!!

Kindly help me....

def trip_cost(city, days): city = hotel_cost(days) + plane_ride_cost(city) days = rental_car_cost(days) total_cost = city + days return total_cost — MishraS
– MishraS, Commented Jan 30, 2015 at 4:41
How do I print total_cost in a statement like "( "Your trip cost for %s many days of stay in %s, when you rent a car for %s number of days is %? " % (days,city,car,?) So - what EXACTLY should replace '?' here, so that the total cost is printed in the output without passing city, days in print ? — MishraS
– MishraS, Commented Jan 30, 2015 at 4:42
python 2 or 3? print("Your trip cost for %s many days of stay in %s, when you rent a car for %s number of days is %s " % (days,city,car,cost)) look at the string formatters docs.python.org/2/tutorial/inputoutput.html and docs.python.org/2/library/stdtypes.html#string-formatting — lxx
– lxx, Commented Jan 30, 2015 at 4:50
That will work for python 2, depends on how you declare the variables and where in your program. — lxx
– lxx, Commented Jan 30, 2015 at 5:15

user4510153 · Accepted Answer · 2015-01-30 05:22:43Z

1

Your function returns a value that can be passed as an argument to print() or a formatted string. For example:

print("Your %s day trip in %s is %0.2f dollars"%(days, city, trip_cost(city, days)))

EDIT: Here's a complete example, which I adapted from your comment.

def plane_ride_cost(city): 
    if city =="Charlotte": 
        return 183 
    elif city == "Tampa": 
        return 220 
    elif city =="Pittsburgh": 
        return 222 
    elif city =="Los Angeles":
        return 475 
    else:
        raise ValueError("No Vacation")

def hotel_cost(days): 
    return 140*days

def rental_car_cost(days):
    return 30*days

def trip_cost(city, days):
    total_cost = 0.0
    total_cost += hotel_cost(days)
    total_cost += plane_ride_cost(city)
    total_cost += rental_car_cost(days)
    return total_cost

city=raw_input("Enter your destination")
days=int(raw_input("Enter the duration of your stay in number of days"))
print("Your %s day trip in %s is %0.2f dollars"%(days, city, trip_cost(city, days)))

edited Jan 30, 2015 at 5:22

answered Jan 30, 2015 at 4:54

user4510153

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3 Comments

MishraS Over a year ago

city=raw_input("Enter your destination") def plane_ride_cost(city): if city =="Charlotte": return 183 elif city == "Tampa": return 220 elif city =="Pittsburgh": return 222 elif city =="Los Angeles": return 475 else: return "No Vacation" days=raw_input("Enter the duration of your stay in number of days") def hotel_cost(days): return 140*days . . . . .. . def trip_cost(city, days): city = hotel_cost(days) + plane_ride_cost(city) days = rental_car_cost(days) total_cost = city + days return total_cost

MishraS Over a year ago

How do I print the "total_cost" in my print statement.

lxx Over a year ago

look at my comment and change cost to total_cost

Vale · Accepted Answer · 2015-01-30 04:50:13Z

0

I'm not sure I understood your question, but you can print the specific values like so:

print("City: %s\nDays: %s\nSpending money: $%s\n") % (city,days,spending_money)

Assuming input was: NYC, 10, and 12345 respectively the output would be:

City: NYC

Days: 10

Spending money: $12345

answered Jan 30, 2015 at 4:50

Vale

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3 Comments

Kevin S Over a year ago

this notation isn't compatible with python 3

MishraS Over a year ago

city=raw_input("Enter your destination") def plane_ride_cost(city): if city =="Charlotte": return 183 elif city == "Tampa": return 220 elif city =="Pittsburgh": return 222 elif city =="Los Angeles": return 475 else: return "No Vacation" days=raw_input("Enter the duration of your stay in number of days") def hotel_cost(days): return 140*days

MishraS Over a year ago

I wish I could paste my code in some clear format - I know, it's not very clear from my question.

Andrew · Accepted Answer · 2015-01-30 05:01:08Z

0

Please clarify exactly what you want to print and what version of python you are using.

def trip_cost(city, days, spending_money):
    total_cost = hotel_cost(days) + plane_cost(city) + rental_car_cost(days) + spending_money 
    print "Total Cost: " + str(total_cost)
    return total_cost

answered Jan 30, 2015 at 5:01

Andrew

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1 Comment

MishraS Over a year ago

I am using the old version - 2.7.3

TDrabas · Accepted Answer · 2015-01-30 05:24:15Z

0

I'm assuming you want to calculate the total cost. In Python 3 then:

hotel_cost_amt = 200
rental_car_amt = 30
plane_ride_amt = {'city_A': 1200, 'city_B': 1100}

def hotel_cost(days):
    return days * hotel_cost_amt

def plane_ride_cost(city):
    return plane_ride_amt[city]

def rental_car_cost(days):
    return rental_car_amt * days

def trip_cost(city, days,spending_money): 
    return hotel_cost(days) + \
        plane_ride_cost(city) + \
        rental_car_cost(days) + \
        spending_money

if __name__ == '__main__':
    days = 7
    city = 'city_A'
    spending_money = 2000

    print('Your trip cost for %i many days of stay in %s, when you rent a car for %i number of days is %i. This includes %i spending money.' % \
        (
            days,
            city,
            days,
            trip_cost(city, days, spending_money),
            spending_money
        )
    )

The function the way you defined it wouldn't work. For Python 2 use

print 'Your trip cost for %i many days of stay in %s, when you rent a car for %i number of days is %i. This includes %i spending money.' % \
        (
            days,
            city,
            days,
            trip_cost(city, days, spending_money),
            spending_money
        )

edited Jan 30, 2015 at 5:24

answered Jan 30, 2015 at 5:10

TDrabas

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4 Comments

MishraS Over a year ago

How do I combine raw_input here ? Like, when I am asking the user to input numbers and names. I tried modifying my code as per your suggestion, it is compiling fine, but I am not getting any output from print !!! I think, I need to try it in Python3. Thanks for your help.

TDrabas Over a year ago

What are you asking the user to input that you later raw_input into? Remember, that raw_input is a string so you need to cast it into either integer (using int(raw_input)) or float: float(raw_input).

MishraS Over a year ago

Does this function look good to you(just by itself) or something is missing - car=raw_input("Enter the number of days when you will rent a car") def rental_car_cost(days): cost = 40*days if days >=7: cost-=50 elif days >=3: cost-=20 return cost

TDrabas Over a year ago

Nope, it should be car_days=int(raw_input("Enter the number of car rental days: ")) Then call rental_car_cost(car_days) The function itself looks ok as long as I understand it without indents.

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