On Tue, 22 Sep 2009 11:03:25 -0700, Brown, Rodrick
<rodrick.br...@citi.com> wrote:
How could I do the following check in Python
In Perl I could do something like if ((defined($a)) { ... }
I tried if var is not None:
However this doesn't seem to work as described.
Thanks.
Could you let us know in what context you're checking to see if a variable
is defined? If you mean "has the name been used before", then bear in mind
Python is a lot stricter about this kind of thing than Perl, and if you've
never used 'var' before the if-statement, you'll probably get a NameError
being raised.
If you want to check whether the name 'var' is bound to a meaningful
object, however (e.g. if it's an optional argument to a function, and you
know it exists, but don't know if it's bound to meaningful data) then your
construction should work.
--
Rami Chowdhury
"Never attribute to malice that which can be attributed to stupidity" --
Hanlon's Razor
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