https://docs.python.org/3/library/functions.html?hight=hasattr#hasattr

1.hasattr(obj, attr): 這個方法用於檢查obj（對象）是否有一個名為attr的值的屬性，放回一個bool值

2.getattr(obj, attr): 調用這個方法將返回obj中名為attr值得屬性的值

3.setattr(obj, attr, val): 調用這個方法將給obj的名為attr的值的屬性賦值為val

s = ‘coop‘

s.upper()

‘COOP‘

isinstance(s,str)  # 檢查實例
 

True

hasattr(s,‘upper‘)  # 檢查字符串是否有這個屬性

True

class People:
    def eat(self):
        print(‘eat apple‘)

    def drink(self):
        print(‘drink water‘)

    def code(self):
        print(‘code python‘)

p = People()

p.eat()

eat apple

p.eat

<bound method People.eat of <__main__.People object at 0x000001AFCD677E80>>
 

hasattr(p,‘eat‘)

True

hasattr(p,‘code‘)

True

getattr(p,‘code‘)

<bound method People.code of <__main__.People object at 0x000001AFCD677E80>>

code123 = getattr(p,‘code‘)

print(code123)

<bound method People.code of <__main__.People object at 0x000001AFCD677E80>>

code123()

code python

setattr(p,‘sleep‘,‘sleeper‘)
 

p.sleep

‘sleeper‘

反射是什麽，what why how