inheritance and how to use it
nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de
Fri Feb 15 18:06:00 CET 2013
Am 15.02.2013 17:59 schrieb Bob Brusa:
> I use a module downloaded from the net. Now I want to build my own
> class, based on the class SerialInstrument offered in this module - and
> in my class I would like to initialize a few things, using e. g. the
> method clear() offered by SerialInstrument. Hence I type:
> class myClass(SerialInstrument)
> def f1(self, str1, str2)
> ...do something etc.
> I then get the message "self not know" from the statement
Which is absolutely correct. Besides, I would have expected some syntax
You try to execute the clear() method during the definition of the
class, not during the instantiation.
Instantiation happens in the __init__() method.
You'll have to do it like this:
def __init__(self, *a, **k): # accept all parameters
super(myClass, self).__init__(*a, **k)
self.clear() # I don't think that self is to be given twice here...
def f1(self, str1, str2):
I have tried many other notations - none worked. What
> works is however the following code - specifying myClass without the
> self.clear(self) in it:
> x = myClass("argument")
Here the clear() is called on the object which has been created, so
after calling the __init__() above (which is, roughly, equivalent to
calling it at the bottom of __init__()).
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