本文共 6824 字，大约阅读时间需要 22 分钟。
有如下文件:
index.py
| 1 | <span style = "font-family:'宋体', SimSun;" > #!/usr/bin/env python<br data-filtered="filtered"># -*- coding:utf-8 -*-<br data-filtered="filtered">__author__ = 'ryan'<br data-filtered="filtered">"""<br data-filtered="filtered">import home<br data-filtered="filtered">print 'oldboy....'<br data-filtered="filtered">url=raw_input('url:')<br data-filtered="filtered">if url == 'home/dev':<br data-filtered="filtered"> ret = home.dev()<br data-filtered="filtered"> print ret<br data-filtered="filtered">if url =='/home/index':<br data-filtered="filtered"> ret = home.index()<br data-filtered="filtered"> print ret<br data-filtered="filtered">if url =='/home/user':<br data-filtered="filtered"> ret = home.user<br data-filtered="filtered"> print ret<br data-filtered="filtered">if url == '/home/passwd':<br data-filtered="filtered"> ret = home.passwd<br data-filtered="filtered"> print ret<br data-filtered="filtered">else:<br data-filtered="filtered"> print '404'<br data-filtered="filtered">"""<br data-filtered="filtered">#getattr、setattr、delattr、 hasattr<br data-filtered="filtered">#找到home文件，将内容加载到内存，然后getattr、setattr、delattr、 hasattr 对home中断函数进行操作<br data-filtered="filtered">#由于函数在没有执行之前，只是将函数名放入内存<br data-filtered="filtered">import home<br data-filtered="filtered">#print dir(home)<br data-filtered="filtered">#print hasattr(home,'dev')#通过函数hasattr到内存中找到home模块，判断home模块下是否存在dev函数，有返回True,否则返回false<br data-filtered="filtered">#print dir(home)<br data-filtered="filtered">#print getattr(home,'dev')#到内存中的home模块中去获取函数dev(其实时获取dev函数在内存中的地址)<br data-filtered="filtered">#print setattr(home,'alex','gentle man')#通过setattr对内存中的home模块添加一个字符串alex<br data-filtered="filtered">#print dir(home)<br data-filtered="filtered">#delattr(home,'dev')#通过delattr删除内存中home模块中的dev函数<br data-filtered="filtered">#print dir(home)<br data-filtered="filtered">#<br data-filtered="filtered">"""<br data-filtered="filtered">class Foo:<br data-filtered="filtered"> static_name='nba'<br data-filtered="filtered"> def __init__(self):<br data-filtered="filtered"> self.name='alex'<br data-filtered="filtered"> def show(self):<br data-filtered="filtered"> pass<br data-filtered="filtered"> @staticmethod<br data-filtered="filtered"> def static_show(self):<br data-filtered="filtered"> pass<br data-filtered="filtered"> @classmethod<br data-filtered="filtered"> def class_show(cls):<br data-filtered="filtered"> pass<br data-filtered="filtered">#obj=Foo()<br data-filtered="filtered">#print Foo.__dict__.keys() #查看类里面的成员<br data-filtered="filtered">#print hasattr(Foo,'static_show')<br data-filtered="filtered">#print obj.__dict__#查看对象里有哪些成员<br data-filtered="filtered">#print hasattr(obj,'name')<br data-filtered="filtered">#print hasattr(obj,'show')#普通方法是存储在类里，但是这里用hasattr函数在对象obj中查找是否存在show方法，返回了Ture，原因是在对象obj中没有找到之后会通过对象指针到创建对象的类中进一步查找，所以这里返回True<br data-filtered="filtered">"""<br data-filtered="filtered">"""<br data-filtered="filtered">print hasattr(Foo,'__init__')<br data-filtered="filtered">print "##########分隔符①################"<br data-filtered="filtered">print hasattr(Foo,'static_name')<br data-filtered="filtered">print "##########分隔符②################"<br data-filtered="filtered">print hasattr(Foo,'show')<br data-filtered="filtered">print "##########分隔符③################"<br data-filtered="filtered">print hasattr(Foo,'static_show')<br data-filtered="filtered">print "##########分隔符④################"<br data-filtered="filtered">print hasattr(Foo,'class_show')<br data-filtered="filtered">obj=Foo()<br data-filtered="filtered">print obj.__dict__<br data-filtered="filtered">print hasattr(obj,'show')<br data-filtered="filtered">print hasattr(obj,'__init__')<br data-filtered="filtered">print "##########分隔符①################"<br data-filtered="filtered">print hasattr(obj,'static_name')<br data-filtered="filtered">print "##########分隔符②################"<br data-filtered="filtered">print hasattr(obj,'show')<br data-filtered="filtered">print "##########分隔符③################"<br data-filtered="filtered">print hasattr(obj,'static_show')<br data-filtered="filtered">print "##########分隔符④################"<br data-filtered="filtered">print hasattr(obj,'class_show')<br data-filtered="filtered">"""<br data-filtered="filtered">"""<br data-filtered="filtered">import home<br data-filtered="filtered">cls = getattr(home,"Foo")<br data-filtered="filtered">print cls<br data-filtered="filtered">s_name = getattr(cls,'static_name')<br data-filtered="filtered">print s_name<br data-filtered="filtered">c_show = getattr(cls,'show')<br data-filtered="filtered">print c_show<br data-filtered="filtered">s_show=getattr(cls,'static_show')<br data-filtered="filtered">print s_show<br data-filtered="filtered">cla_show = getattr(cls,'class_show')<br data-filtered="filtered">print cla_show<br data-filtered="filtered">"""<br data-filtered="filtered">import home<br data-filtered="filtered">cls = getattr(cls,'Foo')<br data-filtered="filtered">obj=cls()#实例化一个对象obj<br data-filtered="filtered">name = getattr(obj,'name')<br data-filtered="filtered">print name<br data-filtered="filtered"></span> |
home.py
| 1 | <span style = "font-family:'宋体', SimSun;" > #!/usr/bin/env python<br># -*- coding:utf-8 -*-<br>__author__ = 'ryan'<br>def index():<br> return 'result home.index'<br>def dev():<br> return 'result home.dev'<br>def user():<br> return 'result home.user'<br>def passwd():<br> return 'result home.passwd'<br>"""<br>class Foo:<br> static_name='nba'<br> def __init__(self):<br> self.name='alex'<br> def show(self):<br> pass<br> @staticmethod<br> def static_show(self):<br> pass<br> @classmethod<br> def class_show(cls):<br> pass<br>"""<br></span> |
反射
fanshe.py
| 1 | <span style = "font-family:'宋体', SimSun;" > #!/usr/bin/env python<br># -*- coding:utf-8 -*-<br>__author__ = 'ryan'<br>url = raw_input('url:')<br>controller,action =url.split('/')<br>import home<br>#action动作是一个字符串，去某个容器（模块）中去找函数，字符串即为函数名，如果有则获取函数<br>func =getattr(home,action)<br>func = dev dev1():<br> return 'result home.dev'<br> ret = func()<br>#func=getattr(home,'index')<br>ret=func()<br>print ret<br></span> |
webdemo.py
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | #!/usr/bin/env python #coding:utf-8 from wsgiref.simple_server import make_server def RunServer(environ, start_response): start_response( '200 OK' , [( 'Content-Type' , 'text/html' )]) url = environ[ 'PATH_INFO' ] temp = url.split( '/' )[ 1 ] import home #去home模块中检查，是否含有指定的函数 is_exist = hasattr (home, temp) #如果存在指定的函数 if is_exist: #获取函数 func = getattr (home, temp) #执行函数并获取返回值 ret = func() #将函数返回值响应响应给请求者，即浏览器 return ret else : #如果不存在函数则返回给浏览器'404 not found' return '404 not found' if __name__ = = '__main__' : httpd = make_server('', 8001 , RunServer) print "Serving HTTP on port 8001..." httpd.serve_forever() |