primitives.none

Module nu.forms.primitives.none_.

None_ - none interface.

Name	Sort	Call	Meaning
None_	`scalar_query`	`None_(source=None)`	None interface. Logical only.

None_

None interface. Logical only.

None_(source=None)

Path nu.forms.None_. Kind ScalarQuery, sort scalar_query, cardinality scalar.

Notes

Wraps Python's None. It's the typical return of an effect-only Command, one that runs for a side effect and yields nothing meaningful (sleep, inc, dec).
== / != build an Eq / Ne term like every other Form, so x == nu.None_() asks whether x yields None at run time. There is no is_.
EMPTY is a distinct sentinel from None: an address that resolved to no value at all, not one that resolved to the value None.

Example

nu.run(nu.None_())[0] is None

True

Methods

`.and_(other)`

Logical AND of self and other.

Builds Bool.

Arguments

Name	Type	Default	Meaning
`other`	`NoneArg`		the value to AND with self. Coerced to Bool by truthiness; `None` is always falsy.

Yields

False, since self is always falsy. An EMPTY operand counts as false.

Notes

Short-circuits like Python: the right operand is only evaluated when the left does not already decide the result.

Example

nu.run(nu.None_().and_(nu.None_()))[0]

False

`.or_(other)`

Logical OR of self and other.

Builds Bool.

Arguments

Name	Type	Default	Meaning
`other`	`NoneArg`		the value to OR with self. Coerced to Bool by truthiness; `None` is always falsy.

Yields

True when other is truthy, False otherwise since self never is. An EMPTY operand counts as false.

Notes

Short-circuits like Python: the right operand is only evaluated when the left does not already decide the result.

Example

nu.run(nu.None_().or_(nu.None_()))[0]

False

`.not_()`

Logical NOT of self.

Builds Bool.

Yields

True. EMPTY when self is EMPTY.

Notes

Self is always falsy, so this always yields True.

Example

nu.run(nu.None_().not_())[0]

True

`.bool_()`

Cast self to Bool.

Builds Bool.

Yields

False. EMPTY when self is EMPTY.

Notes

None is falsy under Python's truthiness rule, so this always yields False.

Example

nu.run(nu.None_().bool_())[0]

False

`a == b`

Self equal to other by value.

Builds Bool.

Arguments

Name	Type	Default	Meaning
`other`	`object`		the value to compare against. Any type; equality never raises for mismatched types, it's just False.

Yields

True when other is also None, False otherwise. EMPTY when either operand is EMPTY.

Example

nu.run(nu.None_() == nu.None_())[0]

True

`a != b`

Self not equal to other by value.

Builds Bool.

Arguments

Name	Type	Default	Meaning
`other`	`object`		the value to compare against.

Yields

True when other is not None, False otherwise. EMPTY when either operand is EMPTY.

Example

nu.run(nu.None_() != 0)[0]

True

Inherited methods

From nu.lang.forms.Form:

Call	Builds	Meaning
`.is_empty()`	`Bool`	True if this Form yields the EMPTY sentinel.
`.not_empty()`	`Bool`	True if this Form does not yield EMPTY.
`.fallback(*alternatives)`	`Self`	The first of this value and `alternatives` that is not EMPTY.

primitives.none_

None_

.and_(other)

.or_(other)

.not_()

.bool_()

a == b

a != b

On this page

`.and_(other)`

`.or_(other)`

`.not_()`

`.bool_()`

`a == b`

`a != b`