# LSCollection Class¶

class localsolver.LSCollection

Value type for collection expressions (lists or sets). Such a value is obtained with LSExpression.value when the expression is a list. It represents a reference to the value of a variable and the value of this variable is modified when the LSCollection object if modified.

## Summary¶

 add Adds the given value to this collection. clear Removes all values of this collection. count Returns the number of values in the collection. contains Returns true if the collection contains the given value, false otherwise. get Gets the value at the given position.
 __str__ Returns a string representation of the values in the collection in the format { val0, val1, ..., valN }ReturnsString representation of this collection. __getitem__ Operator overloading for LSCollection.get(). __contains__ Operator overloading for LSCollection.contains(). __len__ Returns the length of the collection (same result as LSCollection.count()). __iter__ Returns an iterator for the content of this collection.

## Instance methods¶

LSCollection.add(val)

Adds the given value to this collection. Only allowed in state LSState.STOPPED. This function will fail if the given value is outside of the domain of the list or if this value is already included in this list (keep in mind that a list cannot contain twice the same value).

Parameters: val (int) – The value to be added.
LSCollection.clear()

Removes all values of this collection. Only allowed in state LSState.STOPPED.

LSCollection.count()

Returns the number of values in the collection. Elements in collections are indexed from 0 to count()-1.

Returns: Number of values in this LSCollection int
LSCollection.contains(value)

Returns true if the collection contains the given value, false otherwise.

Parameters: value – Element whose presence in this collection is to be tested. True if the collection contains the value bool
LSCollection.get(pos)

Gets the value at the given position.

Parameters: pos (int) – The considered position (must be non negative and strictly smaller than the number of values in the collection). Value at the given position int

## Special operators and methods¶

LSCollection.__str__()

Returns a string representation of the values in the collection in the format { val0, val1, ..., valN }

Returns: String representation of this collection. str
LSCollection.__getitem__(pos)

Operator overloading for LSCollection.get().

LSCollection.__contains__(value)

Operator overloading for LSCollection.contains().

LSCollection.__len__()

Returns the length of the collection (same result as LSCollection.count()).

LSCollection.__iter__()

Returns an iterator for the content of this collection.