using classes

[joseph pareti]

one more question. In the code below, there are 2 init() methods, one for
the class 'Fahrzeug' and one for the class 'PKW'.
The program works when I instantiate the class as:

fiat = PKW("Fiat Marea",50,0)

but it fails if I say:

*fiat = PKW("Fiat Marea",50,0,1)*




*Traceback (most recent call last):  File "erben_a.py", line 19, in
<module>    fiat = PKW("Fiat Marea",50,0,1)TypeError: __init__() takes 4
positional arguments but 5 were given*

yet the statement in *bold* matches IMO the init() method of the PKW class.
Can anyone explain why? Thanks.
---

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__(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",50,0,1)
fiat = PKW("Fiat Marea",50,0)
fiat.einsteigen(3)
fiat.aussteigen(1)
fiat.beschleunigen(10)
print(fiat)


Am Do., 12. März 2020 um 17:38 Uhr schrieb Pieter van Oostrum <
pieter-l at vanoostrum.org>:

> joseph pareti <joepareti54 at gmail.com> writes:
>
> > thank you, that fixes it. I also noticed that both statements work:
> >
> >          super(PKW, self).__init__(bez,ge)
> >
> > or
> >
> >        super().__init__(bez,ge)
>
> The first is the required Python 2 calling (at least the first argument is
> required). The second way can be used in Python 3.
> --
> Pieter van Oostrum
> www: http://pieter.vanoostrum.org/
> PGP key: [8DAE142BE17999C4]
> --
> https://mail.python.org/mailman/listinfo/python-list
>


-- 
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Joseph Pareti - Artificial Intelligence consultant
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