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Groups > comp.lang.python > #38929 > unrolled thread

inheritance and how to use it

Started byBob Brusa <bob.brusa@gmail.com>
First post2013-02-15 17:59 +0100
Last post2013-02-19 16:04 -0600
Articles 6 — 4 participants

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  inheritance and how to use it Bob Brusa <bob.brusa@gmail.com> - 2013-02-15 17:59 +0100
    Re: inheritance and how to use it Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2013-02-15 18:06 +0100
      Re: inheritance and how to use it Bob Brusa <bob.brusa@gmail.com> - 2013-02-15 18:50 +0100
      Re: inheritance and how to use it Dave Angel <davea@davea.name> - 2013-02-15 13:06 -0500
      Re: inheritance and how to use it Bob Brusa <bob.brusa@gmail.com> - 2013-02-15 20:40 +0100
    Re: inheritance and how to use it Tony the Tiger <tony@tiger.invalid> - 2013-02-19 16:04 -0600

#38929 — inheritance and how to use it

FromBob Brusa <bob.brusa@gmail.com>
Date2013-02-15 17:59 +0100
Subjectinheritance and how to use it
Message-ID<mailman.1819.1360947575.2939.python-list@python.org>
<html>
  <head>

    <meta http-equiv="content-type" content="text/html; charset=ISO-8859-15">
  </head>
  <body text="#330099" bgcolor="#FFFFFF">
    Hi,<br>
    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:<br>
    <br>
    class myClass(SerialInstrument)<br>
        self.clear(self)<br>
        def f1(self, str1, str2)<br>
            ...do something etc.<br>
    <br>
    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:<br>
    <br>
    x = myClass("argument")<br>
    x.clear()<br>
    <br>
    How can I integrate this call into the definition of myClass? Thanks
    for advice.<br>
    Bob<br>
  </body>
</html>

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#38930

FromThomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de>
Date2013-02-15 18:06 +0100
Message-ID<kflpto$suo$1@r03.glglgl.gl>
In reply to#38929
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

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#38939

FromBob Brusa <bob.brusa@gmail.com>
Date2013-02-15 18:50 +0100
Message-ID<mailman.1826.1360950608.2939.python-list@python.org>
In reply to#38930
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

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#38943

FromDave Angel <davea@davea.name>
Date2013-02-15 13:06 -0500
Message-ID<mailman.1832.1360951591.2939.python-list@python.org>
In reply to#38930
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

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#38953

FromBob Brusa <bob.brusa@gmail.com>
Date2013-02-15 20:40 +0100
Message-ID<mailman.1840.1360957233.2939.python-list@python.org>
In reply to#38930

[Multipart message — attachments visible in raw view] — view raw

Am 15.02.2013 19:06, schrieb Dave Angel:
> 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().
>
Hi Dave and Thomas,
yep - now its working: See also attachment q4.py

C:\Projekte\TDSsw\mypython>python q4.py
start of program q4.py
->*idn? | "SPEAG","TDS","RUID:00.00-00.00 FW:2.0000 SID:00.00-00.00 
FW:01.00.00"
end of program

Thanks for your kind help - bob

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#39282

FromTony the Tiger <tony@tiger.invalid>
Date2013-02-19 16:04 -0600
Message-ID<jrGdnaN_arhia77MnZ2dnUVZ8madnZ2d@giganews.com>
In reply to#38929
On Fri, 15 Feb 2013 17:59:29 +0100, Bob Brusa wrote:

> <html>
>   <head>
> 
>     <meta http-equiv="content-type" content="text/html;
>     charset=ISO-8859-15">
>   </head>
>   <body text="#330099" bgcolor="#FFFFFF">

Entry > /dev/null

Sigh!

 /Grrr
-- 
          ___                  ___
 (\_--_/)  | _ ._    _|_|_  _   |o _  _ ._
 ( 9  9 )  |(_)| |\/  |_| |(/_  ||(_|(/_|
 stripes are forever - as overripe ferrets

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