用于循环打印类的内存位置而不是列表 [英] For loop printing memory location of class instead of list

问题描述

我有一些代码似乎可以打印 [< __ main __。TCar对象位于0x0245C1B0>] ，但是我希望它打印列表的实际内容。

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)

我的代码有什么问题？

推荐答案

您必须定义 __ str __ 方法或 __ repr __ 方法：

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)

简而言之，

__ repr __ 用于需要显示对象的原始内容的情况您会在显示列表的内容时看到，因此，如果您有汽车列表，则外观如下：

[< Car Tesla Model S 500bhp $ 100000> ;， <汽车智能Fortwo 80bhp $ 5000>]

__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 __ 如果您尝试打印实际对象，例如 print（TeslaCar），其中 TeslaCar 是 TCar 实例。它会给您类似 Tesla Model S 。

__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".

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