Missing Argument Error on video circle.py

Question

followed through with video tutorial and must be oblivious to a wrong input but can't find it. Error reads ' TypeError: init() missing 1 required positional argument 'diameter' ' Code Below.

class Circle: def init(self, diameter): self.diameter = diameter

@property
def radius(self):
    return self.diameter / 2
@radius.setter
def radius(self, radius):
    self.diameter = radius * 2

small = Circle() print(small.diameter) print(small.radius) small.radius = 10 print(small.diameter)

Answer 1 · 2020-07-30T12:37:58Z

July 30, 2020 12:37pm

Hi Callum,

app.py

class Circle:
    def __init__(self, diameter): # <==== "HERE" | 1. init is missing the double underscores 2. diameter is required
        self.diameter = diameter

    @property
    def radius(self):
        return self.diameter / 2

    @radius.setter
    def radius(self, radius):
        self.diameter = radius * 2        

small = Circle()  # <==== "HERE" | 1. A value needs to be passed in here to fulfill the diameter parameter
print(small.diameter) 
print(small.radius) 
small.radius = 10 
print(small.diameter)

I've left some notes for you within the comments of the code above, but essentially what's happening is that because you're not passing an argument to the instance of the Circle() class that you're storing in small, the Circle object isn't able to initiate it's diameter value to anything. If you don't want to have to always pass in an argument (ie. if you want to make diameter an optional parameter), then you'll need to set up the Circle class definition to supply a default value for diameter, which would look something like this:

class Circle:
    def __init__(self, diameter=15):
        self.diameter = diameter

Hope that helps. Nice work so far!

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Callum Anderson

Callum Anderson

Missing Argument Error on video circle.py

1 Answer

Brandon White

Brandon White