Python: How to initialize a class with a list in the constructor

Question

How can you initialize a class by calling a constructor with a list?

class ETF:
    def __init__(self, symbol, name, asset_class):
        self.symbol = symbol
        self.name = name
        self.asset_class = asset_class

this_list = ['qqq','q invests', 'equity']

thisETF = ETF(this_list)

The code above will result in an error message because it only counts the list as one argument:

TypeError: __init__() missing 2 required positional arguments: 'name', 'asset_class'

score 3 · Accepted Answer · answered Sep 21 '20 at 23:04

3

Just unpack the list. It will then pass the list elements to the constructor instead of the list.

thisETF = ETF(*this_list)

answered Sep 21 '20 at 23:04

darcamo

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Awesome, thank you so much. Such a simple solution – FinDev Sep 21 '20 at 23:08

Python: How to initialize a class with a list in the constructor

1 Answers1