Python3 中hasattr()、getattr()、setattr()、delattr()函数及示例代码(2)-木庄网络博客

无

class People:
  country='China'
  def __init__(self,name):
    self.name=name
  def people_info(self):
    print('%s is xxx' %(self.name))
obj=People('aaa')
setattr(People,'x',111) #等同于People.x=111
print(People.x)
#obj.age=18
setattr(obj,'age',18)
print(obj.__dict__)
#{'name': 'aaa', 'age': 18}
print(People.__dict__)
#{'__module__': '__main__', 'country': 'China', '__init__': <function People.__init__ at 0x1007d5620>, 'people_info': <function People.people_info at 0x10215d1e0>, '__dict__': <attribute '__dict__' of 'People' objects>, '__weakref__': <attribute '__weakref__' of 'People' objects>, '__doc__': None, 'x': 111}

delattr()函数

描述：

delattr函数用于删除属性

delattr(x,'foobar)相当于del x.foobar

语法：

setattr(object,name)

参数：

object--对象

name--必须是对象的属性

返回值：

无

示例：

class People:
  country='China'
  def __init__(self,name):
    self.name=name
  def people_info(self):
    print('%s is xxx' %(self.name))
delattr(People,'country') #等同于del People.country
print(People.__dict__)
{'__module__': '__main__', '__init__': <function People.__init__ at 0x1006d5620>, 'people_info': <function People.people_info at 0x10073d1e0>, '__dict__': <attribute '__dict__' of 'People' objects>, '__weakref__': <attribute '__weakref__' of 'People' objects>, '__doc__': None}

补充示例：

class Foo:
  def run(self):
    while True:
      cmd=input('cmd>>: ').strip()
      if hasattr(self,cmd):
        func=getattr(self,cmd)
        func()
  def download(self):
    print('download....')
  def upload(self):
    print('upload...')
# obj=Foo()
# obj.run()