This property returns the current index, or order, of the constraint in the underlying constraint matrix.

Return value:

<span>$</span>= -2<span>$</span> : removed
<span>$</span>= -1<span>$</span> : not in model
<span>$</span>\geq 0<span>$</span> : index of the constraint in the model

Note that the index of a constraint may change after subsequent model modifications.

Example usage:

  c = model.getConstrs()[0]
  print(c.index) # Index will be 0