Hi ironpython,
Here's your Daily Digest of new issues for project "IronPython".
In today's digest:ISSUES
1. [New issue] Strange inconsistency between CPython and IronPython regarding
zip file reading
2. [New comment] ScriptScope.ContainsVariable throws MissingMemberException
internally
3. [New comment] ScriptScope.ContainsVariable throws MissingMemberException
internally
4. [New comment] ScriptScope.ContainsVariable throws MissingMemberException
internally
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ISSUES
1. [New issue] Strange inconsistency between CPython and IronPython regarding
zip file reading
http://ironpython.codeplex.com/workitem/32570
User Markell has proposed the issue:
"http://stackoverflow.com/questions/10123422/strange-inconsistency-between-cpython-and-ironpython-regarding-zip-file-reading
In short:
PS Z:\dev\poc\SDR> ipy64
IronPython 2.7.1 (2.7.0.40) on .NET 4.0.30319.225
Type "help", "copyright", "credits" or "license" for more information.
>>> from zipfile import ZipFile
>>> z=ZipFile('d:/aaa.zip')
>>> input=z.open(z.namelist()[0])
>>> next(input)
b'aaa,bbb\n'
>>> next(input)
'123,456\n'
>>>
Notice the difference in output between the first (aaa,bbb) and the second
(123,456) lines."-----------------
2. [New comment] ScriptScope.ContainsVariable throws MissingMemberException
internally
http://ironpython.codeplex.com/workitem/32530
User rumzeus has commented on the issue:
"Attached file ScriptHostContainsVariableMissingMemberException.cs is a very
simple console application that demonstrates the issue. (When run in Visual
Studio Debug mode with debugger attached.)
> so it's not completely crazy. :)
It's not completely crazy, but I guess the CPython world has different accepted
conventions than the .NET world. And the respective tools are suited more or
less to code in these accepted conventions. So for IronPython it might be
preferable to use conventions that work well with the .NET tools (like the
Visual Studio debugger).
Python Documentation Glossary
http://docs.python.org/release/3.0/glossary.html#term-eafp
"EAFP
Easier to ask for forgiveness than permission. This common Python coding
style assumes the existence of valid keys or attributes and catches exceptions
if the assumption proves false. This clean and fast style is characterized by
the presence of many try and except statements. The technique contrasts with
the LBYL style common to many other languages such as C."
vs.
.NET Design Guidelines for Exceptions
http://msdn.microsoft.com/en-us/library/ms229030.aspx
"Do not use exceptions for normal flow of control, if possible. Except for
system failures and operations with potential race conditions, framework
designers should design APIs so that users can write code that does not throw
exceptions. For example, you can provide a way to check preconditions before
calling a member so that users can write code that does not throw
exceptions.""-----------------
3. [New comment] ScriptScope.ContainsVariable throws MissingMemberException
internally
http://ironpython.codeplex.com/workitem/32530
User KeithJRome has commented on the issue:
"One more thought I had is that (I think) you could use one of the other
overloads of CreateScope() that allows you to provide the storage medium and
just bypass all of the IDMOP plumbing.
For example, you could have your own instance of a IDictionary<string, object>
and pass that to the proper CreateScope() method. IronPython should be fine
with this as far as I know, and your original reference to the IDictionary
should still be valid too. So you can directly access Keys and Values as well
as the indexer of the dictionary without going through any callsite or other
dynamic dispatching.
At least, I believe that statement to be correct. I haven't actually tried it.
Wouldn't this be viable?
var storage = new Dictionary<string, object>();
var scope = engine.CreateScope(storage);
// .... use the scope to execute a script...
var hasMember = storage.ContainsKey("foo");
Or is this just how the scope storage mechanism works?
"-----------------
4. [New comment] ScriptScope.ContainsVariable throws MissingMemberException
internally
http://ironpython.codeplex.com/workitem/32530
User KeithJRome has commented on the issue:
"Actually, I just tried that and it indeed seems to work as expected and allows
you to interrogate the scope directly through the static-typed IDictionary
interface.
Of course, this might not be usable for all situations, but I am not sure what
those cases might be.
I attached an amended copy of your sample to demonstrate. Does this solve the
issues at hand?"
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