class Konto:
    def __init__ (self, inhaber, saldo):
        self.inhaber = inhaber
        self.saldo = saldo
    
    def __repr__(self):
        return f"Konto(inhaber = {self.inhaber!r}, saldo = {self.saldo!r})"
    
    def __str__(self):
        return f"Konto von {self.inhaber}: CHF {self.saldo:.2f}"
    
k = Konto ( " Alice " , 100.0)
print(str(k))   # __str__
print(repr(k))  # __repr__
print(k)        # bevorzugt __str__ , sonst __repr__