For loop printing memory location of class instead of list

Question

I have some code which seems to print [<__main__.TCar object at 0x0245C1B0>] but I want it to print the actual contents of the list.

class TCar():
  def __init__(self, Make, Model, EngineSize, Price):
    self.Make = str(Make)
    self.Model = str(Model)
    self.EngineSize = float(EngineSize)
    self.Price = float(Price)

Garage = []

for i in range(5):
  Make = input("Please enter the make of the car: ")
  Model = input("Please enter the model of the car: ")
  EngineSize = input("Please enter the engine size of the car: ")
  Price = input("Please enter the price of the car: ")
  Garage.append(TCar(Make, Model, EngineSize, Price))
  print(Garage)

What is wrong with my code?

you need to define a `def __str__(self):` – Padraic Cunningham Feb 05 '15 at 10:04 — Padraic Cunningham, Feb 05 '15 at 10:04
You will also see the repr output in the list – Padraic Cunningham Feb 05 '15 at 10:10 — Padraic Cunningham, Feb 05 '15 at 10:10

Igor Hatarist · Answer 1 · 2015-02-05T10:34:17.807

You have to define either a __str__ method or a __repr__ method for that:

class TCar():
  def __init__(self, Make, Model, EngineSize, Price):
    self.Make = str(Make)
    self.Model = str(Model)
    self.EngineSize = float(EngineSize)
    self.Price = float(Price)

  def __repr__(self):
    return "<Car {0} {1} {2} {3}>".format(self.Make, self.Model, self.EngineSize, self.Price)

  def __str__(self):
    return "{0} {1}".format(self.Make, self.Model)

In a nutshell,

__repr__ is used if there's a need to display "raw" content of the object, it's the kind you see when you are displaying the list's contents, so if you have a list of cars, it would look like this:
[<Car Tesla Model S 500bhp $100000>, <Car Smart Fortwo 80bhp $5000>]

__str__ is used if you try to print the actual object, like print(TeslaCar) with TeslaCar being a TCar instance. It would give you something like "Tesla Model S".

score 1 · Answer 2 · answered Feb 05 '15 at 10:08

1

You have a list of objects here. Add something like:-

def __str__(self):
  print self.Make, self.Model, self.EngineSize, self.Price

This would print the value of all attributes of object. Or you can modify the function as per your behavior requirement.

answered Feb 05 '15 at 10:08

Barun Sharma

1,452
2
15
20

score 0 · Answer 3 · edited May 23 '17 at 11:50

You can either override __str__ or __repr__ like this:

class TCar():
  def __init__(self, Make, Model, EngineSize, Price):
    self.Make = str(Make)
    self.Model = str(Model)
    self.EngineSize = float(EngineSize)
    self.Price = float(Price)

  def __repr__(self):
    return "{Make}-{Model} (v{EngineSize}/{Price}$)".format(**self.__dict__)

Garage = [TCar("Audi", "TT", "8", "80000")]
print(Garage)
# [Audi-TT (v8.0/80000.0$)]

Also you might want to check out this question about __str__ vs. __repr__.

score 0 · Answer 4 · answered Feb 05 '15 at 10:14

0

print the attribute one by one rather than printing garange once: print(self.attribute).Note that the attribute in the code is an instance of the object

answered Feb 05 '15 at 10:14

Joshua Abel

1

For loop printing memory location of class instead of list

4 Answers4

Linked

Related