Iterating through constructor's arguments

user_403401 0
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I often find myself writing class constructors like this:

class foo:
    def __init__(self, arg1, arg2, arg3):
        self.arg1 = arg1
        self.arg2 = arg2
        self.arg3 = arg3

This can obviously become a pain if the number of arguments (and class attributes) gets high. I'm looking for the most pythonic way to loop through the constructor's arguments list and assign attributes accordingly. I'm working with Python 2.7, so ideally I'm looking for help with that version.

arguments constructor python
9 Answers

For python >= 3.7 take a look at the @dataclass class decorator. Among other things, it handles your __init__ boilerplate coding problem.

From the doc:

@dataclass
class InventoryItem:
    name: str
    unit_price: float
    quantity_on_hand: int = 0

Will automatically add an __init__ like that:

def __init__(self, name: str, unit_price: float, quantity_on_hand: int=0):
    self.name = name
    self.unit_price = unit_price
    self.quantity_on_hand = quantity_on_hand
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