Python函数调用

Question

我有以下类(class):

from forwind.lidarapi.api import MCLidarGUIPlugin


class MCLidarActions( Handler ):

    tcp_send = Event

    def object__updated_changed( self, info ):
        print info;
        pass;   

    def _tcp_send_changed( self ):
        print( "Click" )

和

from forwind.lidarapi.actions.api import MCLidarActions

class MCUDPActions( MCLidarActions ):

    def object__updated_changed( self, info ):
        pass;   

    def _tcp_send_changed( self ):
        print( "Click UDP" )

当我点击MCLidarActions中的按钮时，将调用_tcp_send_changed函数，我如何扩展这个函数，我也想在MCUDPActions中采取行动。在这种情况下，如果我单击按钮，它将打印出 click 但我也想打印出 Click UDP

Answer 1

如果我正确理解你的问题，你可以这样做:

class MCLidarActions( object ):
    li = []

    tcp_send = 'Event'

    def object__updated_changed( self, info ):
        print info;
        pass;

    def _tcp_send_changed( self ):
        print( "Click" )
        for x in self.li:
            x._tcp_send_changed()


class MCUDPActions( MCLidarActions ):
    def __init__(self):
        self.li.append(self)
    def object__updated_changed( self, info ):
        pass;
    def _tcp_send_changed( self ):
        print( "Click UDP" )


class MC_uuuuuuuuuuuuuutp_Actions( MCLidarActions ):
    def __init__(self):
        self.li.append(self)
    def object__updated_changed( self, info ):
        pass;
    def _tcp_send_changed( self ):
        print( "Click _uuuuuuuuuuuuuutp_" )



M = MCLidarActions()
print 'M, instance of MCLidarActions, created ------------'
print '  executing  M._tcp_send_changed():'
M._tcp_send_changed()


a = MCUDPActions()
print '\na, instance of MCUDPActions, created ------------'
print '  executing  M._tcp_send_changed():'
M._tcp_send_changed()
print
print '  executing  a._tcp_send_changed():'
a._tcp_send_changed()


b = MCUDPActions()
print '\nb, instance of MCUDPActions, created ------------'
print '  executing  M._tcp_send_changed():'
M._tcp_send_changed()
print
print '  executing  a._tcp_send_changed():'
a._tcp_send_changed()
print
print '  executing  b._tcp_send_changed():'
b._tcp_send_changed()


v = MC_uuuuuuuuuuuuuutp_Actions()
print '\nv, instance of MC_uuuuuuuuuuuuuutp_Actions, created ------------'
print '  executing  M._tcp_send_changed():'
M._tcp_send_changed()
print
print '  executing  a._tcp_send_changed():'
a._tcp_send_changed()
print
print '  executing  b._tcp_send_changed():'
b._tcp_send_changed()
print
print '  executing  v._tcp_send_changed():'
v._tcp_send_changed()

结果

M, instance of MCLidarActions, created ------------
  executing  M._tcp_send_changed():
Click

a, instance of MCUDPActions, created ------------
  executing  M._tcp_send_changed():
Click
Click UDP

  executing  a._tcp_send_changed():
Click UDP

b, instance of MCUDPActions, created ------------
  executing  M._tcp_send_changed():
Click
Click UDP
Click UDP

  executing  a._tcp_send_changed():
Click UDP

  executing  b._tcp_send_changed():
Click UDP

v, instance of MC_uuuuuuuuuuuuuutp_Actions, created ------------
  executing  M._tcp_send_changed():
Click
Click UDP
Click UDP
Click _uuuuuuuuuuuuuutp_

  executing  a._tcp_send_changed():
Click UDP

  executing  b._tcp_send_changed():
Click UDP

  executing  v._tcp_send_changed():
Click _uuuuuuuuuuuuuutp_

但是在上面的代码中，需要在基类的每个子类MCUDPActions和MC_uuuuuuuuuuuuuutp_Actions中定义一个函数__init__>MCLidarActions

为了避免这种情况，可以将 li 中的附加内容放在基类中:

class MCLidarActions( object ):
    li = []

    tcp_send = 'Event'

    def __init__(self):
        if self.__class__ != MCLidarActions:
            self.li.append(self)

    def object__updated_changed( self, info ):
        print info;
        pass;

    def _tcp_send_changed( self ):
        print( "Click" )
        for x in self.li:
            x._tcp_send_changed()




class MCUDPActions( MCLidarActions ):
    def object__updated_changed( self, info ):
        pass;
    def _tcp_send_changed( self ):
        print( "Click UDP" )


class MC_uuuuuuuuuuuuuutp_Actions( MCLidarActions ):
    def object__updated_changed( self, info ):
        pass;
    def _tcp_send_changed( self ):
        print( "Click _uuuuuuuuuuuuuutp_" )

结果是完全一样的。