IronLanguages / IronLanguages/ironpython3
.NET arrays bind to params arrays
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.NET interop
regression
- Dominant language
- C#
- Stars
- 2.8k
- Forks
- 316
- Avg merge
- 1d 9h
- Merged PRs (30d)
- 1
Description
For example:
assert list(map(str.upper, System.Array[str](("a", "b")))) == ['A', 'B']
fails with:
TypeError: upper() takes no arguments (2 given)
The method signature is:
public Map(CodeContext context, object? func, [NotNull]params object[] iterables);
This used to work with IronPython 2 because the method signature for map was different:
public static List map(CodeContext/*!*/ context, params object[] param);
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start at the C# map entry point shown in the issue and inspect how the params object[] iterables signature binds a .NET System.Array[str]. Reproduce the Python example and compare it with the IronPython 2 signature. Done means map treats the .NET array as one iterable whose elements are passed individually to the callback.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- csharp, python
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100