Python----面向对象---绑定方法与非绑定方法的应用

1、绑定到对象的方法的应用

class People:
    def __init__(self, name, age, sex):
        self.name = name
        self.age = age
        self.sex = sex

    def tell_info(self):  # 绑定到对象的方法
        print('Name:%s Age:%s Sex:%s' % (self.name, self.age, self.sex))

p = People('egon', 18, 'male')
p.tell_info()  # tell_info(p)

结果为：

Name:egon Age:18 Sex:male

绑定给对象，就应该由对象来调用，自动将对象本身当做第一个参数传入

2、绑定给类，就应该由类来调用，自动将类本身当做第一个参数传入

import setting

class People:
    def __init__(self, name, age, sex):
        self.name = name
        self.age = age
        self.sex = sex

    def tell_info(self):  # 绑定到对象的方法
        print('Name:%s Age:%s Sex:%s' % (self.name, self.age, self.sex))

    @classmethod
    def from_conf(cls):
        obj = cls(
            setting.name,
            setting.age,
            setting.sex
        )
        return obj

# p = People('egon', 18, 'male')
# p.tell_info()  # tell_info(p)
p = People.from_conf()
p.tell_info()

结果为:

Name:xudachen Age:18 Sex:male

3、非绑定方法

import setting
import hashlib
import time

class People:
    def __init__(self, name, age, sex):
        self.id = self.create_id()
        self.name = name
        self.age = age
        self.sex = sex

    def tell_info(self):  # 绑定到对象的方法
        print('Name:%s Age:%s Sex:%s' % (self.name, self.age, self.sex))

    @classmethod
    def from_conf(cls):
        obj = cls(
            setting.name,
            setting.age,
            setting.sex
        )
        return obj

    @staticmethod
    def create_id():
        m = hashlib.md5(str(time.time()).encode('utf-8'))
        return m.hexdigest()

# p = People('egon', 18, 'male')
# p.tell_info()  # tell_info(p)
# p = People.from_conf()
# p.tell_info()

p1 = People('xudachen1', 18, 'male')
p2 = People('xudachen2', 28, 'male')
p3 = People('xudachen3', 38, 'male')

print(p1.id)
print(p2.id)
print(p3.id)

结果为：

1dadcd98fe26e278ce864c2f0cf2e753
bc09cd38527ef257fa3158d4e342ea1b
bc09cd38527ef257fa3158d4e342ea1b

非绑定方法，不与类或者对象绑定，谁都可以调用，没有自动传值一说