> As for the second decorator, sure test(lambda a: print("You are in block %s" % a)) will work,

not for me... 

lanx@nc10-ubuntu:~$ python
Python 2.5.2 (r252:60911, Jan 20 2010, 23:16:55) 
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> def rubyyielder(gen):
...     def wrapped_gen(block):
...         for elem in gen():
...             block(elem)
...     return wrapped_gen
... 
>>> @rubyyielder
... def test():
...     print("In test")
...     yield 1
...     print("back in test")
...     yield 2
... 
>>> test(lambda a: print("You are in block %s" % a))
  File "<stdin>", line 1
    test(lambda a: print("You are in block %s" % a))
                       ^
SyntaxError: invalid syntax

[download]

I suppose the lamda syntax has more restrictions...

> If you used a non-keyword such as "send" instead of "yield" you could do Evil and avoid the first decorator. This is left as an exercise.

Simple, I can just port the semantic of my OP and let send execute the callback which is passed to @test.¹

Cheers Rolf

( addicted to the Perl Programming Language)

Update

¹) at second thought this would require a possibility to access the arguments of the caller. I suppose the caller is an object where arguments are accessible.

Update

deleted undiplomatic irony =)

In reply to Re^10: RFC: Simulating Ruby's "yield" and "blocks" in Perl (Python) by LanX
in thread RFC: Simulating Ruby's "yield" and "blocks" in Perl by LanX

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.