Using generator expressions

[Dom Grigonis]

y = test1(*[a for a in st])
y = test1(*st)
Maybe any of these would be ok for you?

Regards,
DG


> On 25 Sep 2023, at 17:15, Jonathan Gossage via Python-list <python-list at python.org> wrote:
> 
> I am having a problem using generator expressions to supply the arguments
> for a class instance initialization. The following example shows the
> problem:
> 
> class test1(object):
>    def __init__(self, a, b):
> 
>>        self.name = a
> 
>        self.value = b
> st = 'Programming Renaissance, Any'.split(', ')
> y = test1(a for a in st)
> print(f'Object values are: {y._a}, {y._b}')
> 
> I would expect to get the values from the list generated by splitting the
> string passed in as arguments to the new instance of test1, but instead
> I get the generator expression by itself as a generator object. The
> generator
> expression is treated like a passive object instead of being run. If I had
> wanted to pass the generator expression itself, I would have expected to
> have
> to use parentheses around the generator expression. Any suggestions on how
> to
> get the generator expression to run?
> If I change the definition of the input arguments to *args I can capture the
> arguments within __init__ but it is verbose and ugly. Also, I could accept
> the
> arguments from a Sequence and extract the Sequence members into the class
> values. I would prefer my solution if I could get it to work.
> Note that I tried generator expressions both inside parentheses and not,
> without success.
> 
> -- 
> Jonathan Gossage
> -- 
> https://mail.python.org/mailman/listinfo/python-list