# Operators: Toolkits

Toolkits > Operators

## Operators

AddFirstTwoSecondTwo
  Add first two and second two attributes.
AddSeq
  Add a sequence number as the last attribute.
ContainsFilter
  Looks for a string term in any attribute in the tuple.
DeltaFilter
  Drops any tuple that is within a delta of the last tuple for the attribute named `value`.
Lowest
  Find the lowest value above a threshold in all the remaining attributes.
MailSample
Noop
  Pass the tuple along without any change.
NoopSample
PrintTuple
  Print each tuple to standard out.
PrintWithTimeIntervals
  Print tuples with inter-tuple arrival delay.
Range
  Callable: Range
Range37
  Sample of a function as a source operator.
ReturnList
  Demonstrate returning a list of values, each value is submitted as a tuple.
SelectCustomers
  Score customers using a model.
SimpleFilter
  Filter tuples only allowing output if the first attribute is less than the second.
simplesendmail
  Send a simple email.