8.6.8. Constr¶

class Constr¶

Represents a constraint in the model. The index of the constraint increases from 0. Each time a constraint is added to the model, the index is increased by 1. Constraints are usually expressed as an expression.

Properties

index

The index of the constraint

Methods

`getAttr()`	Obtain the attribute value associated with the constraint
`sameAs()`	Test whether the constraint is the same as another constraint
`setAttr()`	Set the attribute value associated with the constraint

getAttr(attrname)¶

Obtain the attribute value associated with the constraint.

Parameters: attrname – Attribute name

example:

m = Model()
x = m.addVar()
c = m.addConstr(2 * x <= 1)
print(c.rhs)
print(c.getAttr(MDO.Attr.RHS))

Note

Attribute can also be read and written directly through object attributes, in this case, the attribute name is case-insensitive

sameAs(constr)¶

Test whether the constraint is the same as another constraint.

Parameters: constr – Another constraint to be tested

example:

m = Model()
x = m.addVar()
c = m.addConstr(2 * x <= 1)
assert (c.sameAs(m.getConstrs()[0]))

setAttr(attrname, attrvalue)¶

Set the attribute value associated with the constraint.

Parameters

attrname – The name of the attribute.
attrvalue – The value of the attribute to be set.

example:

m = Model()
x = m.addVar()
c = m.addConstr(2 * x <= 1)
c.rhs = 2.0
c.setAttr(MDO.Attr.RHS, 2.0)

Note

Attribute can also be read and written directly through object attributes, in this case, the attribute name is case-insensitive