[Tutor] Dots-And-Boxes

[Kalle Svensson]

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[I wrote about assert statements]
> __debug__ is always true if you haven't started python with the -O
> option.  For example:
> 
> : kalle@chloe [~]$ ; python -O -c "assert 0; print 'Hi'"
> Hi
> : kalle@chloe [~]$ ; python -c "assert 0; print 'Hi'"
> Traceback (most recent call last):
>   File "<string>", line 1, in ?
> AssertionError

Note, though:

: kalle@chloe [~]$ ; python -c "__debug__ = 0; assert 0; print 'Hi'"
<string>:0: SyntaxWarning: can not assign to __debug__
Hi
: kalle@chloe [~]$ ; python -V
Python 2.1.3

That is, __debug__ can be assigned to in Python 2.1.3 (and earlier),
but it will raise a SyntaxWarning (in 2.1.x).

: kalle@chloe [~]$ ; python2.2 -c "__debug__ = 0; assert 0; print 'Hi'"
  File "<string>", line 1
SyntaxError: can not assign to __debug__
: kalle@chloe [~]$ ; python2.2 -V
Python 2.2.1

In Python 2.2 it is no longer possible to assign to __debug__.

Peace,
  Kalle
- -- 
Kalle Svensson, http://www.juckapan.org/~kalle/
Student, root and saint in the Church of Emacs.
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