#NEWLINE# def validate( self , table ) : #NEWLINE# #INDENT# column = table . columns [ self . _column_name ] #NEWLINE# if ( not isinstance ( column . data_type , Number ) ) : #NEWLINE# #INDENT# raise DataTypeError ( 'StDev can only be applied to columns containing Number data.' ) #NEWLINE# #UNINDENT# has_nulls = HasNulls ( self . _column_name ) . run ( self ) #NEWLINE# if has_nulls : #NEWLINE# #INDENT# warn_null_calculation ( self , column )