Also, if one have in mind that dict addition with the `+` operator had been
recelently approved, as of Python 3.9 it will be ok to write:
```
return ({
'user_id': user_id,} +
({'max_results': max_results} if max_results else {}) +
({'active': active} if active is not None else {}) +
({'deleted': deleted} if deleted is not None else {})
)
And actually, on a second though, this is already valid as of current
Python - and is potentially more
readable than a magic "dict.skip" singleton.
```
return {
'user_id': user_id,
**({'max_results': max_results} if max_results else {}),
**({'active': active} if active is not None else {}),
**({'deleted': deleted} if deleted is not None else {})
}
```
On Thu, 5 Sep 2019 at 10:22, <brian.sk...@gmail.com> wrote:
> I thought of something similar, but where the dict-literal construction is
> desired:
>
> >>> foo = True
> >>> bar = False
> >>> baz = False
> >>> d = {
> ... 'foo' if foo else None: 1,
> ... 'bar' if bar else None: 2,
> ... 'baz' if baz else None: 3,
> ... }
> >>> d
> {'foo': 1, None: 3}
> >>> d.pop(None)
> 3
> >>> d
> {'foo': 1}
>
> The natural helper function for the "'foo' if foo else None" snip would
> then be something like:
>
> >>> def key_flag(key, flag, default=None):
> ... return key if flag else default
> ...
> >>> dd = {
> ... key_flag('foo', foo): 1,
> ... key_flag('bar', bar): 2,
> ... key_flag('baz', baz): 3,
> ... }
> >>> dd
> {'foo': 1, None: 3}
> >>> dd.pop(None)
> 3
> >>> dd
> {'foo': 1}
>
> -Brian
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