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

[Frankduc]

__init__ not __int__. Hard to see because you often see what you expect to see, not what is really there.

If an attribute created in __init__() is not in the object, test if __init__() is called.

class Portfolio:
    def __int__(self):
        print("Enter __init__()")
        self.holdings = {}  #key = ticker, Value = number of shares
        print("Leave __init__()")

When I created a Portfolio object it didn't print anything. That means __init__() wasn't called. Knowing that it didn't take long to find the error.

I saw with the Python tutor https://pythontutor.com/visualize.html#mode=display something was wrong with that part of the code: def __int__(self):

It also return AttributeError: 'Portfolio' object has no attribute 'holdings'

How to solve it is something else.
I am not sure what is going on here:

str_len = len(max(p)[0])
 
for (ticker, shares) in p:
    if len(ticker) < str_len:
        spacer = ' '*(str_len - len(ticker) + 2)
    else:
        spacer = ' '*2
    print(f'{ticker} {spacer} {shares}')

Menator spoke about a hidden character.