using classes

[Barry]

> On 12 Mar 2020, at 14:28, joseph pareti <joepareti54 at gmail.com> wrote:
> 
> thank you, that fixes it. I also noticed that both statements work:
> 
>         super(PKW, self).__init__(bez,ge)

This form is for python 2 compatibility.
> 
> or
> 
>       super().__init__(bez,ge)

This is the python 3 way. If you do not have to care about python 2 then this is the form to use.

Barry

> 
>> Am Do., 12. März 2020 um 12:58 Uhr schrieb MRAB <python at mrabarnett.plus.com
>>> :
>> 
>>> On 2020-03-12 10:54, joseph pareti wrote:
>>> The following code that uses a class 'Fahrzeug' and an inherited class
>>> 'PKW' runs correctly. However, if I use the 'super ' statement in in the
>>> PKW class, it ends with the following error message:
>>> 
>>> 
>>> 
>>> *Traceback (most recent call last):  File "erben_a.py", line 19, in
>>> <module>    fiat = PKW("Fiat Marea",50,0)  File "erben_a.py", line 11, in
>>> __init__    super(PKW, self).__init__()TypeError: __init__() missing 2
>>> required positional arguments: 'bez' and 'ge'*
>>> 
>>> ----- CODE THAT WORKS -------
>>> class Fahrzeug:
>>>     def __init__(self, bez, ge):
>>>       self.bezeichnung = bez
>>>       self.geschwindigkeit = ge
>>>     def beschleunigen(self, wert):
>>>       self.geschwindigkeit += wert
>>>     def __str__(self):
>>>       return self.bezeichnung + " " +str(self.geschwindigkeit) + " km/h"
>>> class PKW(Fahrzeug):
>>>     def __init__(self, bez, ge, ins):
>>>        Fahrzeug.__init__(self, bez, ge)
>>>        self.insassen = ins
>>>     def __str__(self):
>>>        return Fahrzeug.__str__(self) + " " + str(self.insassen) + "
>>> Insassen"
>>>     def einsteigen(self, anzahl):
>>>        self.insassen += anzahl
>>>     def aussteigen(self, anzahl):
>>>        self.insassen -= anzahl
>>> fiat = PKW("Fiat Marea",50,0)
>>> fiat.einsteigen(3)
>>> fiat.aussteigen(1)
>>> fiat.beschleunigen(10)
>>> print(fiat)
>>> 
>>> -----CODE THAT FAILS --------------
>>> class Fahrzeug:
>>>     def __init__(self, bez, ge):
>>>       self.bezeichnung = bez
>>>       self.geschwindigkeit = ge
>>>     def beschleunigen(self, wert):
>>>       self.geschwindigkeit += wert
>>>     def __str__(self):
>>>       return self.bezeichnung + " " +str(self.geschwindigkeit) + " km/h"
>>> class PKW(Fahrzeug):
>>>     def __init__(self, bez, ge, ins):
>>>        *super(PKW, self).__init__()*
>>>        self.insassen = ins
>>>     def __str__(self):
>>>        return Fahrzeug.__str__(self) + " " + str(self.insassen) + "
>>> Insassen"
>>>     def einsteigen(self, anzahl):
>>>        self.insassen += anzahl
>>>     def aussteigen(self, anzahl):
>>>        self.insassen -= anzahl
>>> fiat = PKW("Fiat Marea",50,0)
>>> fiat.einsteigen(3)
>>> fiat.aussteigen(1)
>>> fiat.beschleunigen(10)
>>> print(fiat)
>>> 
>>> 
>> The traceback tells you what the problem is. The line should be:
>> 
>>     super(PKW, self).__init__(bez, ge)
>> --
>> https://mail.python.org/mailman/listinfo/python-list
>> 
> 
> 
> -- 
> Regards,
> Joseph Pareti - Artificial Intelligence consultant
> Joseph Pareti's AI Consulting Services
> https://www.joepareti54-ai.com/
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