data_expression

(class from pyomo.core.kernel.expression)

class pyomo.core.kernel.expression.data_expression(expr=None)

Bases: expression

A named, mutable expression that is restricted to storage of data expressions. An exception will be raised if an expression is assigned that references (or is allowed to reference) variables.

__init__(expr=None)

Methods

__init__([expr])
activate()	Activate this object.
arg(i)
clone()	Return a clone of this expression (no-op).
create_node_with_local_data(values)	Construct an expression after constructing the contained expression.
deactivate()	Deactivate this object.
getname([fully_qualified, name_buffer, ...])	Dynamically generates a name for this object.
is_component_type()	Return True if this class is a Pyomo component
is_constant()	A boolean indicating whether this expression is constant.
is_expression_type([expression_system])	A boolean indicating whether this in an expression.
is_fixed()	A boolean indicating whether this expression is fixed.
is_indexed()	Return True if this numeric value is an indexed object
is_logical_type()	Return True if this class is a Pyomo Boolean object.
is_named_expression_type()	A boolean indicating whether this in a named expression.
is_numeric_type()	Return True if this class is a Pyomo numeric object
is_parameter_type()	A boolean indicating whether this expression is a parameter object.
is_potentially_variable()	A boolean indicating whether this expression can reference variables.
is_reference()	Return True if this object is a reference.
is_relational()	DEPRECATED.
is_variable_type()	A boolean indicating whether this expression is a variable object.
nargs()	Length of self._nargs()
polynomial_degree()	Always return zero because we always validate that the stored expression can never reference variables.
to_string([verbose, labeler, smap, ...])	Convert this expression into a string.

Attributes

PRECEDENCE
active	The active status of this object.
args	A tuple of subexpressions involved in this expressions operation.
ctype	The object's category type.
expr	The stored expression
local_name	The object's local name within the context of its parent.
name	The object's fully qualified name.
parent	The object's parent (possibly None).
storage_key	The object's storage key within its parent

Member Documentation

activate()

Activate this object.

clone()

Return a clone of this expression (no-op).

create_node_with_local_data(values)

Construct an expression after constructing the contained expression.

This class provides a consistent interface for constructing a node, which is used in tree visitor scripts.

deactivate()

Deactivate this object.

getname(fully_qualified=False, name_buffer={}, convert=<class 'str'>, relative_to=None)

Dynamically generates a name for this object.

Parameters:

• fully_qualified (bool) – Generate a full name by iterating through all ancestor containers. Default is False.

• convert (function) – A function that converts a storage key into a string representation. Default is the built-in function str.

• relative_to (object) – When generating a fully qualified name, generate the name relative to this block.

Returns:

If a parent exists, this method returns a string representing the name of the object in the context of its parent; otherwise (if no parent exists), this method returns None.

is_component_type()

Return True if this class is a Pyomo component

is_constant()

A boolean indicating whether this expression is constant.

is_expression_type(expression_system=None)

A boolean indicating whether this in an expression.

is_fixed()

A boolean indicating whether this expression is fixed.

is_indexed()

Return True if this numeric value is an indexed object

is_logical_type()

Return True if this class is a Pyomo Boolean object.

Boolean objects include constants, variables, or logical expressions.

is_named_expression_type()

A boolean indicating whether this in a named expression.

is_numeric_type()

Return True if this class is a Pyomo numeric object

is_parameter_type()

A boolean indicating whether this expression is a parameter object.

is_potentially_variable()

A boolean indicating whether this expression can reference variables.

is_reference()

Return True if this object is a reference.

is_relational()

DEPRECATED.

Return True if this numeric value represents a relational expression.

Deprecated since version 6.4.3: is_relational() is deprecated in favor of is_expression_type(ExpressionType.RELATIONAL)

is_variable_type()

A boolean indicating whether this expression is a variable object.

nargs()

Length of self._nargs()

polynomial_degree()

Always return zero because we always validate that the stored expression can never reference variables.

to_string(verbose=None, labeler=None, smap=None, compute_values=False)

Convert this expression into a string.

property active

The active status of this object.

property args

A tuple of subexpressions involved in this expressions operation.

property ctype

The object’s category type.

property expr

The stored expression

property local_name

The object’s local name within the context of its parent. Alias for obj.getname(fully_qualified=False).

property name

The object’s fully qualified name. Alias for obj.getname(fully_qualified=True).

property parent

The object’s parent (possibly None).

property storage_key

The object’s storage key within its parent