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from math import pi as pi
class Kreis_gettattr:
def __init__(self, radius):
self.radius = radius
self.operators ={
'durchmesser': lambda x: self.radius * 2
'umfang': lambda x: self.durchmesser * pi
'flaeche': lambda: x: self.radius**2 *pi
}
def __getattr(self, name):
if name not in self.operators:
raise TypeError(f'unbekannte Operation {name}')
return {
} [name]