创建一个Rectangle类 [英] Creating a Rectangle class

问题描述

我真的不太了解类，任何帮助都会很棒。

I really don't understand classes very much and any help would be great.

Rectangle类应具有以下私有数据属性：

Rectangle class should have the following private data attributes:

• __ length


• __ width

• __length
• __width

Rectangle类应具有 __ init __ 方法，创建这些属性并将其初始化为1。它还应具有以下方法：

The Rectangle class should have an __init__ method that creates these attributes and initializes them to 1. It should also have the following methods:

• set_length –此方法为 __ length 字段

set_width –此方法为 __ width 字段分配一个值

set_width – this method assigns a value to the __width field

get_length –此方法返回 __ length 字段的值

get_length – this method returns the value of the __length field

get_width –此方法返回 __ width 字段的值

get_width – this method returns the value of the __width field

get_area –此方法返回Rectangle的面积

get_area – this method returns the area of Rectangle

__ str __ –此方法返回对象的状态

__str__ – this method returns the object’s state

class Rectangle:

  def __init__(self):
      self.set_length = 1
      self.set_width = 1
      self.get_length = 1
      self.get_width = 1
      self.get_area = 1

def get_area(self):
    self.get_area = self.get_width * self.get_length
    return self.get_area


def main():

  my_rect = Rectangle()

  my_rect.set_length(4)
  my_rect.set_width(2)

  print('The length is',my_rect.get_length())
  print('The width is', my_rect.get_width())

  print('The area is',my_rect.get_area())
  print(my_rect)

  input('press enter to continue')

推荐答案

您的类遇到了一些问题。参见下面的注释

You've got a few issues with your class. See the below comments

class Rectangle:
    # Init function
    def __init__(self):
        # The only members are length and width
        self.length = 1
        self.width = 1

    # Setters
    def set_width(self, width):
        self.width = width

    def set_length(self, length):
        self.length = length

    # Getters
    def get_width(self):
        return self.width

    def get_length(self):
        return self.length

    def get_area(self):
        return self.length * self.width

    # String representation
    def __str__(self):
        return 'length = {}, width = {}'.format(self.length, self.width)

测试班级

>>> a = Rectangle()
>>> a.set_width(3)
>>> a.set_length(5)
>>> a.get_width()
3
>>> a.get_length()
5
>>> a.get_area()
15
>>> print(a)
length = 5, width = 3

和getter在Python中是多余的，因为所有成员变量都是公共的。我知道这些方法是您分配工作所必需的，但是在将来，您知道您可以省去麻烦，直接访问成员即可

As others have noted, setter's and getter's are superfluous in Python, as all member variables are public. I understand that these methods are required for your assignment, but in the future, know that you can save yourself the trouble and just directly access the members

>>> a.length       # Instead of the getter
5
>>> a.length = 2   # Instead of the setter
>>> a.length
2

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