Intro to OOP

Object-Oriented Programming(物件導向)

my_list = [1, 2, 3, 4]
print(type(my_list))
----------------------------------------------------
<class 'list'>

class Robot:
    pass

my_robot = Robot()
print(type(my_robot))
----------------------------------------------------
<class '__main__.Robot'>

• The naming convention of class name is — always capitalize the first letter!
• __init __ → 念法(dounder init)
  • Print value
  • Compare
  • __doc __
  • Method

Class Attribute, Static Method and Class Method

• 如果放在1.的位置會佔記憶體，多一個attribute

class Robot:

    ingrediant = "metal"  # 2. 改放在class下面

    def __init__(self, name, age):
        self.name = name
        self.age = age
        #self.ingrediant = "metal"  # 1. 這邊不太適合
print(Robot.ingrediant)
----------------------------------------------------
metal

• 可抓取global variable

• Class attributes can be accessed by either

  1. self.class.attribute(inside method definition)
  2. objectname.attribute(outside method definition)
  3. classname.attribute(try not to use this in method definition)

Inside a method, when referring to the class itself, try to use self.class as nuch as possible. Avoid hard code the class name.

→ 若寫在class name下，只要class name修改，全部使用到此class name的都要改

• self.class.attribute

• static method

• class method

• 補充 : 使用static method和class method的差別