#NEWLINE# @ classmethod #NEWLINE# def isns( cls , ns ) : #NEWLINE# #INDENT# try : #NEWLINE# #INDENT# return ( isinstance ( ns , tuple ) and ( len ( cls ) == len ( cls . default ) ) ) #NEWLINE# #UNINDENT# except : #NEWLINE# #INDENT# pass #NEWLINE# #UNINDENT# return False