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Home/ Questions/Q 893799
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Editorial Team
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Editorial Team
Asked: May 15, 20262026-05-15T14:16:42+00:00 2026-05-15T14:16:42+00:00

in school we got this class file: class Konto: def __init__(self, nummer): self.__nr =

  • 0

in school we got this class file:

class Konto:
    def __init__(self, nummer):
        self.__nr = nummer
        self.__stand = 0
        self.__minimum = -1000.0

    def getStand(self):
        return self.__stand

    def getNr(self):
        return self.__nr

    def einzahlen(self, betrag):
        self.__stand = self.__stand + betrag

    def auszahlen(self, betrag):
        if self.__stand - betrag >= self.__minimum:
            self.__stand = self.__stand - betrag
        else:
            print("Auszahlung nicht möglich!")

class Sparkonto(Konto):
    def __init__(self, nummer):
        Konto.__init__(self, nummer)
        self.__zinssatz = None
        self.__minimum = 0
        self.__maxAuszahlung = 2000.0

    def setZinssatz(self, zinssatz):
        self.__zinssatz = zinssatz

    def getZinssatz(self):
        return self.__zinssatz

    def auszahlen(self, betrag):
        if betrag <= self.__maxAuszahlung:
            Konto.auszahlen(self, betrag)
        else:
            print("Auszahlung nicht möglich!")

    def zinsenGutschreiben(self):
        zinsen = self.__stand * (self.__zinssatz / 100)
        self.einzahlen(zinsen)

When I run this test programm:

#Test
from sparkonto import *
s = Sparkonto(1)
s.einzahlen(1000)
print(s.getStand())
s.setZinssatz(4)
print(s.getZinssatz())
s.zinsenGutschreiben()
print(s.getStand())
s.auszahlen(2500)
print(s.getStand())

I get this error

1000
4
Traceback (most recent call last):
  File "/home/malte/home/py3/sparkonto/test.py", line 8, in <module>
    s.zinsenGutschreiben()
  File "/home/malte/home/py3/sparkonto/sparkonto.py", line 44, in zinsenGutschreiben
AttributeError: 'Sparkonto' object has no attribute '_Sparkonto__einzahlen'
>>> 

We do not know what we are doing wrong. Any guess?

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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-05-15T14:16:43+00:00Added an answer on May 15, 2026 at 2:16 pm

    Daniel was halfway there, you do need to change self.__einzahlen -> self.einzaheln, as he said.

    Also, self.__stand belongs to the parent class. With the double underscore in the name, it gets mangled used anywhere else. But you don’t need to use self.__stand directly. Konto gives you getStand().

    Try something like this:

    def zinsenGutschreiben(self):
        zinsen = self.getStand() * (self.__zinssatz / 100)
        self.einzahlen(zinsen)
    
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