Enchancement suggestion for argparse: intuit type from default
cs at zip.com.au
Thu Mar 15 11:35:03 CET 2012
On 15Mar2012 10:06, Robert Kern <robert.kern at gmail.com> wrote:
| On 3/15/12 5:59 AM, Cameron Simpson wrote:
| > On 15Mar2012 12:22, Ben Finney<ben+python at benfinney.id.au> wrote:
| > | Roy Smith<roy at panix.com> writes:
| > |> I'll admit I hadn't considered that, but I don't see it as a major
| > |> problem. The type intuition could be designed to only work for types
| > |> other than NoneType.
| > |
| > | −1, then. It's growing too many special cases, and is no longer simple
| > | to describe, so that indicates it's probably a bad idea.
| > If `type` is not supplied and `default` is present and not None, `type`
| > shall be the type of `default`.
| > That seems straightforward to me. [... sentinels aside...] the `type`
| > should always match type(default). Or am I wrong about that?
| Yes. Not all type(default) types can be called with a string to produce a valid
| value. Note that "type=" is really a misnomer. argparse doesn't really want a
| type object there; it wants a converter function that takes a string to an object.
Aha. Still, you could change the docs to say you only need type= if
type(default) _isn't_ useful as the string->value converter.
Cameron Simpson <cs at zip.com.au> DoD#743
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