Issue 14673: Add sys.implementation

'name' to 'expression' as the latter is what the string actually represents.
The bug in this issue was only catching NameError and AttributeError when
evaluating an expression that was not necessarily a name.

Code patch by Roger Serwy.

This is a behavior change: before this leading and trailing spaces were
stripped from ASCII parts, now they are preserved.  Without this fix we didn't
parse the examples in the RFC correctly, so I think breaking backward
compatibility here is justified.

Patch by Ralf Schlatterbeck.

Use a threshold of 20 ms instead of 10 ms.

Initial patch by Michael Driscoll, I added the example.

Initial patch by Michael Driscoll, I added the example.