Does a variable exist ?

[czemiello]

Hello ! In python there is a useful method try and except:

try:
print str(variable)+':Variable exist'
except:
print 'not exist'


Pozdro

[GiantG]

same in MEL
http://download.autodesk.com/us/maya/2010help/Commands/catch.html

[~NoMaD~]

I am also wondering if there is a way to destroy a variable if it's not gonna be used anymore.



Restarting Maya is about the only way to clear variables, unless you include them in a procedure... while testing scripts try putting {} around the script and Maya wont keep the vairables in memory after it runs.

eg.

{
string $test[] = `ls -mat`;
print $test;
}

Run the above and it will print the materials...

print $test;

but this line will return an error.

[Jacobborsting]

In python you can also do:

if 'myVar' in locals():
print 'the variable myVar exist'

[shibumenon]

the mel command
whatIs "$theVariable"
would return "Unknown" if $theVariable doesnot exist

[th0rse]

Thanks for your replies

For now, I will do what Shibu said.
One of these days I have to start learning Python.

:-)

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