从“lambda” function 传递

Question

In Python I'm using a class out of library. I only want to call certain functions if a certain parameter is set.

For example:

import pyserial

serialobj=serial.Serial()

parameter=0
#The part idk about
def serialobjpass()
     if parameter=1:
         pass Argument to serialobj.

serialobj might be serialobj.write() or serialobj.recieve() I would be just like a man in the middle to siphone out calls when i dont want them

Answer 1

Something like this may work:

class Forwarder(object):
  def __init__(self, target):
    self.target = target
    self.parameter = 1
  def read(self, n):
    print(('READ', n))
    if self.parameter:
      return self.target.read(n)
    else:
      return 0
  def write(self, data):
    print(('WRITE', data))
    if self.parameter:
      return self.target.write(data)
    else:
      return len(data)

import pyserial
serialobj = Forwarder(serial.Serial())
...
serialobj.write('HELLO\r\n')
print([serialobj.read(1)])
self.parameter = 0  # Prevent subsequent reads or writes.
serialobj.write('World\r\n')  # Won't be written to the serial port.

In this setup the the Forwarder object intercepts all calls to the .read and .write methods, and calls the original .read and .write methods depending on how the parameter is set.