jinja2.nodes.Const

class documentation

class Const(Literal):

All constant values. The parser will return this node for simple constants such as 42 or "foo" but it can be used to store more complex values such as lists too. Only constants with a safe representation (objects where eval(repr(x)) == x is true).

Class Method	`from_untrusted`	Return a const object if the value is representable as constant value in the generated code, otherwise it will raise an `Impossible` exception.
Method	`as_const`	Return the value of the expression as constant or raise `Impossible` if this was not possible.
Class Variable	`fields`	Undocumented
Class Variable	`value`	Undocumented

Inherited from Literal:

Class Variable abstract Undocumented

Inherited from Expr (via Literal):

Method can_assign Check if it's possible to assign something to this node.

Inherited from Node (via Literal, Expr):

Method	`find`	Find the first node of a given type. If no such node exists the return value is `None`.
Method	`find_all`	Find all the nodes of a given type. If the type is a tuple, the check is performed for any of the tuple items.
Method	`iter_child_nodes`	Iterates over all direct child nodes of the node. This iterates over all fields and yields the values of they are nodes. If the value of a field is a list all the nodes in that list are returned.
Method	`iter_fields`	No summary
Method	`set_ctx`	No summary
Method	`set_environment`	Set the environment for all nodes.
Method	`set_lineno`	Set the line numbers of the node and children.
Method	`__eq__`	Undocumented
Method	`__init__`	Undocumented
Method	`__repr__`	Undocumented
Method	`dump`	Undocumented
Class Variable	`attributes`	Undocumented
Class Variable	`environment`	Undocumented
Class Variable	`lineno`	Undocumented

@classmethod
def from_untrusted(cls, value, lineno=None, environment=None):

Return a const object if the value is representable as constant value in the generated code, otherwise it will raise an Impossible exception.

Parameters
value:`t.Any`	Undocumented
lineno:`t.Optional[int]`	Undocumented
environment:`t.Optional[Environment]`	Undocumented
Returns
`Const`	Undocumented

def as_const(self, eval_ctx=None):

overrides jinja2.nodes.Expr.as_const

Return the value of the expression as constant or raise Impossible if this was not possible.

An EvalContext can be provided, if none is given a default context is created which requires the nodes to have an attached environment.

Changed in version 2.4: the eval_ctx parameter was added.

Parameters
eval_ctx:`t.Optional[EvalContext]`	Undocumented
Returns
`t.Any`	Undocumented

fields: tuple[str, ...] =

overrides jinja2.nodes.Node.fields

Undocumented

value: t.Any =

Undocumented