File "<string>", line 19, in <module> error is related to what?

[Frankduc]

Hello,

I am trying to understand what is going on:

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class Portfolio:     def __int__(self):         self.holdings = {}  #key = ticker, Value = number of shares               def buy(self, ticker, shares):         self.holdings[ticker] = self.holdings.get(ticker, 0) + shares               def sell(self, ticker, shares):         self.holdings[ticker] = self.holdings.get(ticker, 0) - shares               def __iter__(self):         return iter(self.holdings.items())                     p = Portfolio() p.buy('Alpha', 15) p.buy('Beta', 23) p.buy('Gamma', 9) p.buy('Gamma', 20) p.sell('Beta', 5)   for (ticker, shares) in p:     print(ticker, shares)

According to the errors output:

Error:
Traceback (most recent call last):
  File "<string>", line 19, in <module>
  File "<string>", line 9, in buy
AttributeError: 'Portfolio' object has no attribute 'holdings'
> 

I am missing a module? But which one?

Thank you