# Topic 3 - Getting there

#1

def hotel_cost(nights):
return 140 * nights

Please help,they say I didn't created a function called plane_ride_cost,but I don't know what's wrong with the code!!

def plane_ride_cost(city):
if city == "Charlotte":
return 183 * nights
elif city == "Tampa":
return 220 * nights
elif city == "Pittsburgh":
return 222 * nights
elif city == "Los Angeles":
return 475 * nights

#2

``````def plane_ride_cost(city):
if city == "Charlotte":
return 183 * nights
elif city == "Tampa":
return 220 * nights
elif city == "Pittsburgh":
return 222 * nights
elif city == "Los Angeles":
return 475 * nights``````

The problem is when you return the price times multiplied by the number of nights, because `nights` is not a parameter you have set in `plane_ride_cost()`, so it wont recognise it.

My code:

``````def hotel_cost(nights):
return 140 * nights
def plane_ride_cost(city):
if city == "Charlotte":
return 183
elif city == "Tampa":
return 220
elif city == "Pittsburgh":
return 222
else:
return 475``````

Do you see all of the differences? In mine, there's no `return (x) * nights`, and there's no `elif city == "Los Angeles"`, because that's been replaced with `else` .

#3

for the last bit, does it have to be else? It can't be if, elif, elif, elif?

Thanks!

This is my code and I also get the 'did you create a function called plane_ride_cost?' error

``````def hotel_cost(nights):
return 140*nights

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``````

EDIT: Oh got it! I was missing quotation marks around the cities. The system accepted my elif for the Los Angeles part.

#4

Yes if, elif ... elif does work, but I recommend that you always use if elif else, just for good practice.