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This function allows you to control the syntax of a script while writing it.
Redirect Output to Messages Panel
When enabled, this option allows the usage of Python's "print" statement. You do not have to wrap your text into a scene.message(str) command anymore, but can use direct statements instead, e.g. print "Hello!" or print 7 + 5. Another advantage is that you will get Python's full error text. This is helpful for debugging scripts with def statements and for tracing bugs.
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