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| Element | Description | Value |
|---|---|---|
| Identifier | resource ID | http://old.zope.org/Members/Brian/PythonNet/Collector/14 |
| Title | resource name | Suggestion for change in handling of out parameters |
| Description | resource summary | Currently, PythonNet differs from IronPython (and pythoncom) in requiring a python parameter to be passed in the position of an out parameter. That is, PythonNet requires: Double.TryParse("1.23", 0) // .NET v2 overload of TryParse where IronPython would have: Double.TryParse("1.23") I think PythonNet should adopt the convention of not including a parameter in the python call signature if that parameter is marked out-only. By out-only, I mean (IsOut && !IsIn) when testing the ParameterInfo. There are some parameters which are both in and out, notably the buffer parameter of Stream.Read. In this case, of course, python code must supply a parameter (interestingly, I believe IronPython 0.7.5 may have a bug in ReflectedMethodBase.BindArgs in that it appears to ignore all IsOut params without checking IsIn). The buffer param of Stream.Read brings up another difference with IronPython: it is not marked as an IsByRef type, and so IronPython will not include it in its result tuple (see ReflectedMethodBase.MakeReturnValue), whereas PythonNet will (since it is marked IsOut). I prefer IronPython's behavior here. So, I hope you will consider adopting the following rules for method calls: 1) Parameters for which (IsOut && !IsIn) is true do not appear in the python call signature. 2) The python result of a method call is, in the general case, a tuple made up of the method result (if any) followed by all the IsByRef parameters. 3) If the above tuple would have only one element, then that element is returned directly. 4) If the tuple has no elements, then None is returned. I patched methodbinder.cs in RC1 to incorporate these rules; I can send you a diff if you're interested. |
| Creator | resource creator | glchapman |
| Date | default date | 2005-06-08 14:35:43 |
| Format | resource format | text/html |
| Type | resource type | Collector Issue |
| Subject | resource keywords | General, feature, medium |
| Contributors | resource collaborators | |
| Language | resource language | |
| Publisher | resource publisher | No publisher |
| Rights | resource copyright | |
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| Element | Description | Value |
| CreationDate | date resource created | 2005-06-08 14:08:15 |
| ModificationDate | date resource last modified | 2005-06-08 14:35:43 |
| EffectiveDate | date resource becomes effective | None |
| ExpirationDate | date resource expires | None |
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