__init__() missing 1 required positional argument

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You’re receiving this error because you did not pass a data variable to the DHT constructor.

aIKid’s and Alexander’s answers are nice but won’t work because you still have to initialize self.data in the class constructor like this:

class DHT:
    def __init__(self, data=None):
        self.data = data if data is not None else {}
        self.data['one'] = '1'
        self.data['two'] = '2'
        self.data['three'] = '3'

    def showData(self):
        print(self.data)

And then calling the method showData like this:

DHT().showData()

Or like this:

DHT({'six':6,'seven':'7'}).showData()

or like this:

# Build the class first
dht = DHT({'six':6,'seven':'7'})
# The call whatever method you want (In our case only 1 method available)
dht.showData()

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