def buildNumbers( expression ):
digitLists = parseNumbersExpression( expression )
if ( len( digitLists ) == 1 ):
return RPNGenerator.createGenerator( convertStringsToNumbers, digitLists )
else:
return RPNGenerator.createStringProduct( digitLists )
def permuteLists( lists ):
for i in lists:
if not isinstance( i, ( list, RPNGenerator ) ):
raise ValueError( '\'permute_lists\' expects a list of lists' )
return RPNGenerator.createProduct( lists )
