Python - Variable length argument list within class

Question

I have tried to produce a simplified version of what I am trying to accomplish; here it is:

class CustomString():
    def __init__(self, function):
        self._creator_function = function

    @property
    def string(self, *args):
        return self._creator_function(*args)


def creator1(arg1):
    return 'Hello ' + arg1

def creator2(arg1, arg2):
    return 'Aloha ' + arg1 + ',' + arg2

The CustomString class is meant to be a dynamic string generator, which is provided a function on initialisation that performs that returns the string given specific arguments. Those functions might take an explicit number of arguments, as in the example below, but the class method should be flexible because each instance might have a different creator function.

If I run the following:

c = CustomString(creator1)
c.string('John')

I would expect to see:

'Hello John'

But I get an error instead:

TypeError: creator1() missing 1 required positional argument: 'arg1'

Why is string a property?

wjandrea
– wjandrea

2020-01-27 15:19:26 +00:00
Commented Jan 27, 2020 at 15:19 — wjandrea
– wjandrea, Commented Jan 27, 2020 at 15:19

hurlenko · Accepted Answer · 2020-01-27 15:20:00Z

2

Remove property from string

class CustomString():
    def __init__(self, function):
        self._creator_function = function

    def string(self, *args):
        return self._creator_function(*args)


def creator1(arg1):
    return 'Hello ' + arg1

def creator2(arg1, arg2):
    return 'Aloha ' + arg1 + ',' + arg2

c = CustomString(creator1)
print(c.string('John')) # prints Hello John

answered Jan 27, 2020 at 15:20

hurlenko

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