feynml.interface.formcalc.fermion.Fermion

class feynml.interface.formcalc.fermion.Fermion(sign: int, type: int, i: int, sequenceform: feynml.interface.formcalc.sequenceform.SequenceForm)

Bases: Particle

__init__(sign: int, type: int, i: int, sequenceform: SequenceForm) → None

Methods

__init__(sign, type, i, sequenceform)
from_str(fermion)	Example
get_pdgid()	Example
n()	Example
re()

Attributes

sign
type
i
sequenceform

classmethod from_str(fermion: str)

Example

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

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

get_pdgid() → int

Example

>>> Fermion(1, 3, 1, SequenceForm("Col", 1)).get_pdgid()
2
>>> Fermion(-1, 4, 1, SequenceForm("Col", 1)).get_pdgid()
-1

classmethod n()

Example

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