feynml.interface.formcalc.rule.Rule

class feynml.interface.formcalc.rule.Rule(lhs: feynml.interface.formcalc.field.Field, rhs: feynml.interface.formcalc.particle.Particle | str)

Bases: object

__init__(lhs: Field, rhs: Particle | str) → None

Methods

__init__(lhs, rhs)
from_str(rule)	Example
n()	Example
re()

Attributes

lhs
rhs

classmethod from_str(rule: str)

Example

>>> str(Rule.from_str("Field[1] -> V[1]"))
'Field[1] -> V[1]'

>>> str(Rule.from_str('Field[1] -> F[1, {1, SequenceForm["Col", 1]}]'))
'Field[1] -> F[1, {1, SequenceForm["Col", 1]}]'

>>> str(Rule.from_str('Field[4] -> V[5, {SequenceForm["Glu", 4]}]'))
'Field[4] -> V[5, {SequenceForm["Glu", 4]}]'

classmethod n()

Example

>>> Rule.n() == Rule.re().count('(') - Rule.re().count('(?')
True