#NEWLINE# def evaluateBooleanValue( self , exprStack , contextItem = None ) : #NEWLINE# #INDENT# if ( ( len ( exprStack ) > 0 ) and isinstance ( exprStack [ 0 ] , ProgHeader ) ) : #NEWLINE# #INDENT# progHeader = exprStack [ 0 ] #NEWLINE# return self . effectiveBooleanValue ( progHeader , self . evaluate ( exprStack , contextItem ) ) #NEWLINE# #UNINDENT# return False