[Python-Dev] None as a keyword / class methods

[bwarsaw@cnri.reston.va.us]

Hi Peter!

>>>>> "PF" == Peter Funk <pf@artcom-gmbh.de> writes:

    PF> Since something like 'del for' or 'del import' raises a
    PF> SyntaxError exception in Py152, I expect 'del None' to raise
    PF> the same exception in Py3K, after None has become a keyword.
    PF> Right?

I misread your example the first time through, but it still doesn't
quite parse on my second read.

-------------------- snip snip --------------------
pyvers = '2k'
try:
    del import
except SyntaxError:
    pyvers = '3k'
-------------------- snip snip --------------------
% python /tmp/foo.py
  File "/tmp/foo.py", line 3
    del import
             ^
SyntaxError: invalid syntax
-------------------- snip snip --------------------

See, you can't catch that SyntaxError because it doesn't happen at
run-time.  Maybe you meant to wrap the try suite in an exec?  Here's a
code sample that ought to work with 1.5.2 and the mythical
Py3K-with-a-None-keyword.

-------------------- snip snip --------------------
pyvers = '2k'
try:
    exec "del None"
except SyntaxError:
    pyvers = '3k'
except NameError:
    pass

print pyvers
-------------------- snip snip --------------------

Cheers,
-Barry