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Hi,
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)
*** self.clear(self)
*** def f1(self, str1, str2)
*** *** ...do something etc.

I then get the message "self not know" from the statement self.clear(self). 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")
x.clear()

How can I integrate this call into the definition of myClass? Thanks for advice.
Bob

Am 15.02.2013 17:59 schrieb Bob Brusa:
> Hi,
> 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)
> self.clear(self)
> def f1(self, str1, str2)
> ...do something etc.
>
> I then get the message "self not know" from the statement
> self.clear(self).

Which is absolutely correct. Besides, I would have expected some syntax
errors.

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:

class myClass(SerialInstrument):
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):
pass

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")
> x.clear()

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__()).


Thomas

Am 15.02.2013 18:06, schrieb Thomas Rachel:
> Am 15.02.2013 17:59 schrieb Bob Brusa:
>> Hi,
>> 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)
>> self.clear(self)
>> def f1(self, str1, str2)
>> ...do something etc.
>>
>> I then get the message "self not know" from the statement
>> self.clear(self).
>
> Which is absolutely correct. Besides, I would have expected some syntax
> errors.
>
> 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:
>
> class myClass(SerialInstrument):
> 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):
> pass
>
> 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")
>> x.clear()
>
> 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__()).
>
>
> Thomas

Thomas,
This does not work either. The error comes while python analyses the
code - even prior to executing my program.... But what I want to achieve
is that this clear() is executed when the class is instantiated....which
I do with the code

x = myClass("COM7")

Of course, when scanning the class definition, the argument "COM7" is
not yet known.
Thanks for further help. Bob

On 02/15/2013 12:50 PM, Bob Brusa wrote:
> Am 15.02.2013 18:06, schrieb Thomas Rachel:
>> Am 15.02.2013 17:59 schrieb Bob Brusa:
>>> Hi,
>>> 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)
>>> self.clear(self)
>>> def f1(self, str1, str2)
>>> ...do something etc.
>>>
>>> I then get the message "self not know" from the statement
>>> self.clear(self).
>>
>> Which is absolutely correct. Besides, I would have expected some syntax
>> errors.
>>
>> 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:
>>
>> class myClass(SerialInstrument):
>> 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):
>> pass
>>
>> 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")
>>> x.clear()
>>
>> 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__()).
>>
>>
>> Thomas
>
> Thomas,
> This does not work either. The error comes while python analyses the
> code - even prior to executing my program.... But what I want to achieve
> is that this clear() is executed when the class is instantiated....which
> I do with the code
>
> x = myClass("COM7")
>
> Of course, when scanning the class definition, the argument "COM7" is
> not yet known.
> Thanks for further help. Bob
>

Your error is on line 115, so what does it look like, and its context?
I expect you're never getting to the line x = myClass().

--
DaveA