反射--hasattr

class Person(object):
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def qqxing(self):
        print('QQ星')


alex = Person('alex', 36)

# ret = getattr(alex, 'name')  # 得到对象alex中实例变量name的值
# print(ret)
#
# ret = getattr(alex, 'qqxing') # 得到对象alex中qqxing函数的地址
# ret() # 调用qqxing函数

if hasattr(alex, 'name'): # 判断对象alex是否有name变量
    ret = getattr(alex, 'name')
    print(ret)

if hasattr(alex, 'qqxing'):
    if callable(getattr(alex, 'qqxing')): # 判断该函数地址是否可调用
        getattr(alex, 'qqxing')()