python self method

最新推荐文章于 2022-01-19 15:19:13 发布

linjing0504

最新推荐文章于 2022-01-19 15:19:13 发布

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分类专栏： python基础文章标签： python

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本文深入探讨了Python中self关键字的作用及使用场景，解释了它如何帮助访问类的属性和方法，以及为什么Python选择self而非其他语法。通过实例展示了self在构造函数和类方法中的应用。

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'''
The self is used to represent the instance of the class. With this keyword, you can access the attributes and methods of the class in python. It binds the attributes with the given arguments. The reason why we use self is that Python does not use the ‘@’ syntax to refer to instance attributes. In Python, we have methods that make the instance to be passed automatically, but not received automatically.


'''
print('******Example*****')

class food():


    # init method or constructor
    def __init__(self, fruit, color):
        self.fruit = fruit


        self.color = color


    def show(self):
        print("fruit is", self.fruit)


        print("color is", self.color)

apple = food("apple", "red")
grapes = food("grapes", "green")

apple.show()
grapes.show()

print('******Python Class self Constructor*****')

'''
In the  example, self refers to the name variable of the entire Person class. Here, if we have a variable within a method, self will not work. That variable is simply existent only while that method is running and hence, is local to that method. For defining global fields or the variables of the complete class, we need to define them outside the class methods.

'''
class Person:
    # name made in constructor
    def __init__(self, John):
        self.name = John


    def get_person_name(self):
        return self.name

print('******Example*****')
class this_is_class:
    def show(in_place_of_self):

        print("It is not a keyword "
              "and you can use a different keyword")


object = this_is_class()
object.show()