I am having trouble understanding the following instructions in an exercise:

1. Create another class Location which has two properties called coordinate and name.

2. Each time an instance of Location is created, a class Coordinate should be created that gets passed in the coordinates that should be given as arguments when creating Location.

3. Further, you should create a return_location method that returns the name of the location.

4. An array locations which is a class variable of Location stores every Location that is created.

So far I have this:

class Coordinate:
    def __init__(self,latitude,longitude):
        self.latitude = latitude
        self.longitude = longitude
    def return_coord(self):
        return self.latitude, self.longitude

class Location:
  locations = [0]

  def __init__(self,coordinate,name):
    self.coordinate = coordinate 
    self.name = name 
    locations.append(self) #store every location created on the array locations  

  def return_location():
    return self.name

But I am not sure if I am indeed doing the second step correctly and when trying to do the 4th step it shows me the error: NameError: Name ´locations´ is not defined, did you mean Location?

CodePudding user response：

For the error you're receiving, you should be using Location.locations.append(self) rather than locations.append(self)

CodePudding user response：

My understanding of step 2 is that Location.__init__() should receive latitude and longitude as separate arguments, and you need to create a Location instance from them.

There's no need to put 0 in the initial locations list. It should start out empty, and you append to it when you create new Location instances.

class Location:

  locations = [] 

  def __init__(self,lat, long,name):
    self.coordinate = Coordinate(lat, long)
    self.name = name 
    locations.append(self) #store every location created on the array locations  

  def return_location():
    return self.name