Yes, Python doesn't have block scopes.

It has 4 scope levels° - it took me a while to understand them - and function scope is the smallest.

To mimic something similar to blocks you'll need again a named function in Python, since "lambdas" (aka anonymous subs in Perl) are limited to one statement only. Python compensates it by allowing nested named functions, leading to enclosed scope. *

> push @out, {A => $one, b => $two} while my ($one, undef, $two) = some_function())

This is certainly not doing what you expect, those $one and $two variables are different.

  DB<17> @out=()

  DB<18> $x=2; push @out, { A =>$one } while my $one = $x--

  DB<19> x @out
0  HASH(0x31f07b8)
   'A' => undef
1  HASH(0x31f0410)
   'A' => undef
  DB<20> @out=()

  DB<21> $x=2; push @out, { A =>$one } while $one = $x--

  DB<22> x @out
0  HASH(0x32023b0)
   'A' => 2
1  HASH(0x3202428)
   'A' => 1
  DB<23>

[download]

Please keep in mind that declarations are only effective for following statements.

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

°) Local, Global, Built-in, Enclosed

UPDATE

*) remember Py's mantra about "explicit is better than implicit"? Perl's scoping rules are explicit ones here (and easier to understand)

In reply to Re^4: A short whishlist of Perl5 improvements leaping to Perl7 by LanX
in thread A short whishlist of Perl5 improvements leaping to Perl7 by rsFalse

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.