hasattr菜鸟实例：
#!/usr/bin/python
# -*- coding: UTF-8 -*-
class Coordinate:
x = 10
y = -5
z = 0
point1 = Coordinate()
print(hasattr(point1, 'x'))
print(hasattr(point1, 'y'))
print(hasattr(point1, 'z'))
print(hasattr(point1, 'no')) # 没有该属性
结果：
True
True
True
False
getattr菜鸟实例：
>>>class A(object):
... bar = 1
...
>>> a = A()
>>> getattr(a, 'bar') # 获取属性 bar 值
1
>>> getattr(a, 'bar2') # 属性 bar2 不存在，触发异常
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'A' object has no attribute 'bar2'
>>> getattr(a, 'bar2', 3) # 属性 bar2 不存在，但设置了默认值
3
>>>
开源项目实例：
from sys import modules
# UserDB is the default auth_class
authname = auth.UserDB #UserDB为类对象
# Is the auth_class defined in the config file?
if self.cfg.has_option('honeypot', 'auth_class'): #包含auth_class值：UserDB
authclass = self.cfg.get('honeypot', 'auth_class')
authmodule = "cowrie.core.auth"
# Check if authclass exists in this module
if hasattr(modules[authmodule], authclass): #模块中有此
authname = getattr(modules[authmodule], authclass)
else:
log.msg('auth_class: %s not found in %s' %
(authclass, authmodule))
theauth = authname(self.cfg)
