Python API - GenConstr#

class GenConstr#

Gurobi general constraint object. General constraints are always associated with a particular model. You add a general constraint to a model either by using one of the Model.addGenConstr* methods, or by using Model.addConstr or Model.addConstrs plus a general constraint helper function).

General constraint objects have a number of attributes, which can be queried with the GenConstr.getAttr method. The full list can be found in the Attributes section of this document.

getAttr(attrname)#

Query the value of a general constraint attribute. The full list of available attributes can be found in the Attributes section.

Raises an AttributeError if the requested attribute doesn’t exist or can’t be queried. Raises a GurobiError if there is a problem with the GenConstr object (e.g., it was removed from the model).

Parameters:

attrname – The attribute being queried.

Returns:

The current value of the requested attribute.

Example:
print(genconstr.getAttr(GRB.Attr.GenConstrType))
print(genconstr.getAttr("GenConstrType"))
setAttr(attrname, newvalue)#

Set the value of a general constraint attribute. Note that, due to our lazy update approach, the change won’t actually take effect until you update the model (using Model.update), optimize the model (using Model.optimize), or write the model to disk (using Model.write).

The full list of available attributes can be found in the Attributes section.

Raises an AttributeError if the specified attribute doesn’t exist or can’t be set. Raises a GurobiError if there is a problem with the GenConstr object (e.g., it was removed from the model).

Parameters:

  • attrname – The attribute being modified.

  • newvalue – The desired new value of the attribute.