Python Tip: Properties with a parameter

This is probably”unpython” and whatever, but I do a lot of automation, and being able to access properties based on some index (like a port number) is pretty important. This is especially true since getting a property isn’t reading a variable, it’s actually reading the value from some piece of equipment.

And, in case pastebin dissapears:

# This was created based on a response from Alex Martelli at:
# http://bytes.com/topic/python/answers/35919-property-parameter#post133951
# There’s probably a way to do this with an object (without the .property)

class ParameterProperty(object):
    # Allows using a property with a parameter, such as
    #   portSpeed[3] = 1000
    #   print portSpeed[3]
   
    def __init__(self,getparam,setparam):
        # Initialize by specifying the getter and setter functions.
        self.getparam = getparam
        self.setparam = setparam
       
    def getPropertyAccessor(self):
        # create a class with get and set
       
        class PropertyArrayAccessor: pass           # class to return
       
        def getter(__, parameter):                  # create getter function
            return self.getparam(parameter)         # return the value from the function specified during init
           
        def setter(__, parameter, value):           # create setter function
            self.setparam(parameter,value)          # call the function specified during init

        # property will use these get and set functions
        PropertyArrayAccessor.__getitem__ = getter
        PropertyArrayAccessor.__setitem__ = setter
           
        return PropertyArrayAccessor()                # return the class object
   
    property