IronPython error related to long boolean expressions?

Question

It seems like something funny is going on here. Using IronPython 2.6.2 for .NET 4.0, I get the following behavior. The simplest case is as follows:

• I am launching an interactive shell

• I type the next line 5 times

  False or False or False or False or False or False or \
  

• Then I end it with the next line

  False or False or False or False or False or False
  

As I type this, the process ran 30 minutes of the processor on a pretty good desktop and still doesn't return.

If I reduce step 2 by 1, that is, it has a row 4 times, then it returns in about a minute or two.

If I decrease step 2 by 2, i.e. have a line 3 times, then it returns after about a second or so.

So what is happening and why?

Of course, the real world example that made me isolate this is much more complex and not so frivolous.

Thanks Akil

Answer 1

CodePlex. , , IronPython OrExpression AST node . . , OrExpression - . 2- , . OrExpression.cs :

return _left.Type == _right.Type ? _left.Type : typeof(object);

Type lType = _left.Type;
return lType == _right.Type ? lType : typeof(object);

.