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particle_collections.py
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particle_collections.py
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"""Collections of `~plasmapy.particles.particle_class.Particle` objects."""
__all__ = ["ionic_levels", "ParticleList", "ParticleListLike"]
import astropy.units as u
import collections
import contextlib
import numpy as np
from numbers import Integral
from typing import Callable, Iterable, List, Optional, Sequence, Tuple, Union
from plasmapy.particles.decorators import particle_input
from plasmapy.particles.exceptions import ChargeError, InvalidParticleError
from plasmapy.particles.particle_class import (
CustomParticle,
DimensionlessParticle,
Particle,
ParticleLike,
)
class ParticleList(collections.UserList):
"""
A `list` like collection of
`~plasmapy.particles.particle_class.Particle` and/or
`~plasmapy.particles.particle_class.CustomParticle` objects.
Parameters
----------
particles : iterable, optional
An iterable that provides a sequence of
`~plasmapy.particles.particle_class.ParticleLike` objects.
Objects that are not a `~plasmapy.particles.particle_class.Particle`
or `~plasmapy.particles.particle_class.CustomParticle` instance
will be cast into a `~plasmapy.particles.particle_class.Particle`
instance.
Raises
------
`~plasmapy.particles.exceptions.InvalidParticleError`
If an object supplied to |ParticleList| is not
`~plasmapy.particles.particle_class.ParticleLike`.
TypeError
If a `~plasmapy.particles.particle_class.DimensionlessParticle`
is provided.
Examples
--------
A |ParticleList| can be created by calling it with a `list`,
`tuple`, or other iterable that provides
`~plasmapy.particles.particle_class.ParticleLike` objects.
>>> from plasmapy.particles import ParticleList
>>> particle_list = ParticleList(["e-", "e+"])
>>> particle_list[0]
Particle("e-")
Attributes such as
`~plasmapy.particles.particle_collections.ParticleList.mass`
and `~plasmapy.particles.particle_collections.ParticleList.charge`
will return a `~astropy.units.Quantity` array containing the values
of the corresponding attribute for each particle in the
|ParticleList|.
>>> particle_list.mass
<Quantity [9.1093...e-31, 9.1093...e-31] kg>
>>> particle_list.charge
<Quantity [-1.60217663e-19, 1.60217663e-19] C>
>>> particle_list.symbols
['e-', 'e+']
|ParticleList| instances can also be created through addition and
multiplication with `~plasmapy.particles.particle_class.Particle`,
`~plasmapy.particles.particle_class.CustomParticle`, and
|ParticleList| instances.
>>> from plasmapy.particles import Particle, CustomParticle
>>> import astropy.units as u
>>> proton = Particle("p+")
>>> custom_particle = CustomParticle(mass=1e-26*u.kg, charge=6e-19*u.C)
>>> 2 * proton + custom_particle
ParticleList(['p+', 'p+', 'CustomParticle(mass=1e-26 kg, charge=6e-19 C)'])
These operations may also be performed using
`~plasmapy.particles.particle_class.ParticleLike` objects.
>>> particle_list + "deuteron"
ParticleList(['e-', 'e+', 'D 1+'])
Normal `list` methods may also be used on |ParticleList| objects.
When a `~plasmapy.particles.particle_class.ParticleLike` object is
appended to a |ParticleList|, that object will be cast into a
`~plasmapy.particles.particle_class.Particle`.
>>> noble_gases = ParticleList(["He", "Ar", "Kr", "Xe", "Rn"])
>>> noble_gases.append("Og")
>>> noble_gases[-1]
Particle("Og")
The ``>`` operator may be used with
`~plasmapy.particles.particle_class.Particle` and |ParticleList|
instances to access the nuclear reaction energy.
>>> reactants = ParticleList(["deuterium", "tritium"])
>>> products = ParticleList(["alpha", "neutron"])
>>> energy = reactants > products
>>> energy.to("MeV")
<Quantity 17.58925... MeV>
"""
@staticmethod
def _list_of_particles_and_custom_particles(
particles: Optional[Iterable[ParticleLike]],
) -> List[Union[Particle, CustomParticle]]: # TODO #687
"""
Convert an iterable that provides
`~plasmapy.particles.particle_class.ParticleLike` objects into a
`list` containing `~plasmapy.particles.particle_class.Particle`
and `~plasmapy.particles.particle_class.CustomParticle` instances.
"""
new_particles = []
if particles is None:
return new_particles
for obj in particles:
if isinstance(obj, (Particle, CustomParticle)):
new_particles.append(obj)
elif isinstance(obj, DimensionlessParticle):
raise TypeError(
"ParticleList instances cannot include dimensionless particles."
)
else:
try:
new_particles.append(Particle(obj))
except (TypeError, InvalidParticleError) as exc:
raise InvalidParticleError(
f"The object {obj} supplied to ParticleList is not a "
f"particle-like object."
) from exc
return new_particles
def __init__(self, particles: Optional[Iterable] = None):
self._data = self._list_of_particles_and_custom_particles(particles)
@staticmethod
def _cast_other_as_particle_list(other):
if isinstance(other, ParticleList):
return other
with contextlib.suppress(TypeError, InvalidParticleError):
return ParticleList(other)
try:
return ParticleList([other])
except (InvalidParticleError, TypeError):
raise InvalidParticleError(f"Cannot cast {other} into a ParticleList")
def __add__(self, other):
try:
other_as_particle_list = self._cast_other_as_particle_list(other)
except (TypeError, InvalidParticleError) as exc:
raise InvalidParticleError(
f"Cannot add {repr(other)} to a ParticleList."
) from exc
return ParticleList(self.data + other_as_particle_list.data)
def __radd__(self, other):
other_as_particle_list = self._cast_other_as_particle_list(other)
return other_as_particle_list.__add__(self)
def __repr__(self):
return f"ParticleList({repr(self.symbols)})"
def __gt__(self, other):
from plasmapy.particles.nuclear import nuclear_reaction_energy
other_as_particle_list = self._cast_other_as_particle_list(other)
return nuclear_reaction_energy(
reactants=self.symbols, products=other_as_particle_list.symbols
)
def __str__(self):
return self.__repr__()
def _get_particle_attribute(self, attr, unit=None, default=None):
"""
Get the values of a particular attribute from all of the particles.
If a ``unit`` is provided, then this function will return a
`~astropy.units.Quantity` array with that unit.
"""
values = [getattr(particle, attr, default) for particle in self.data]
if unit:
values = u.Quantity(values)
return values
def append(self, particle: ParticleLike):
"""Append a particle to the end of the |ParticleList|."""
# TODO: use particle_input when it works with CustomParticle and ParticleLike
if not isinstance(particle, (Particle, CustomParticle)):
particle = Particle(particle)
self.data.append(particle)
@property
def charge(self) -> u.C:
"""
A `~astropy.units.Quantity` array of the electric charges
of the particles.
"""
return self._get_particle_attribute("charge", unit=u.C, default=np.nan * u.C)
@property
def data(self) -> List[Union[Particle, CustomParticle]]:
"""
A `list` containing the particles contained in the
|ParticleList| instance.
The `~plasmapy.particles.particle_collections.ParticleList.data`
attribute should not be modified directly.
"""
return self._data
def extend(self, iterable: Iterable[ParticleLike]):
"""
Extend the sequence by appending
`~plasmapy.particles.particle_class.ParticleLike` elements from
``iterable``.
"""
if isinstance(iterable, ParticleList):
self.data.extend(iterable)
else:
for obj in iterable:
self.append(obj)
@property
def half_life(self) -> u.s:
"""
A `~astropy.units.Quantity` array of the half-lives of the
particles.
"""
return self._get_particle_attribute("half_life", unit=u.s, default=np.nan * u.s)
def insert(self, index, particle: ParticleLike):
"""Insert a particle before an index."""
# TODO: use particle_input when it works with CustomParticle and ParticleLike
if not isinstance(particle, (Particle, CustomParticle)):
particle = Particle(particle)
self.data.insert(index, particle)
def is_category(
self,
*category_tuple,
require: Union[str, Iterable[str]] = None,
any_of: Union[str, Iterable[str]] = None,
exclude: Union[str, Iterable[str]] = None,
) -> List[bool]:
"""
Determine element-wise if the particles in the |ParticleList|
meet categorization criteria.
Return a `list` in which each element will be `True` if the
corresponding particle is consistent with the categorization
criteria, and `False` otherwise.
Please refer to the documentation of
`~plasmapy.particles.particle_class.Particle.is_category`
for information on the parameters and categories, as well as
more extensive examples.
Examples
--------
>>> particles = ParticleList(["proton", "electron", "tau neutrino"])
>>> particles.is_category("lepton")
[False, True, True]
>>> particles.is_category(require="lepton", exclude="neutrino")
[False, True, False]
>>> particles.is_category(any_of=["lepton", "charged"])
[True, True, True]
"""
return [
particle.is_category(
*category_tuple,
require=require,
any_of=any_of,
exclude=exclude,
)
for particle in self
]
@property
def charge_number(self) -> np.array:
"""
An array of the quantized charges of the particles, as
multiples of the elementary charge.
"""
return np.array(self._get_particle_attribute("charge_number", default=np.nan))
@property
def mass(self) -> u.kg:
"""A `~astropy.units.Quantity` array of the masses of the particles."""
return self._get_particle_attribute("mass", unit=u.kg, default=np.nan * u.J)
@property
def mass_energy(self) -> u.J:
"""
A `~astropy.units.Quantity` array of the mass energies of the
particles.
If the particle is an isotope or nuclide, return the mass energy
of the nucleus only.
"""
return self._get_particle_attribute(
"mass_energy",
unit=u.J,
default=np.nan * u.J,
)
def sort(self, key: Callable = None, reverse: bool = False):
"""
Sort the |ParticleList| in-place.
For more information, refer to the documentation for `list.sort`.
"""
if key is None:
raise TypeError("Unable to sort a ParticleList without a key.")
else:
self._data.sort(key=key, reverse=reverse)
@property
def symbols(self) -> List[str]:
"""A `list` of the symbols of the particles."""
return self._get_particle_attribute("symbol")
def average_particle(
self,
abundances=None,
*,
use_rms_charge: bool = False,
use_rms_mass: bool = False,
) -> Union[CustomParticle, Particle]:
"""
Return a particle with the average mass and charge.
By default, the mean will be used as the average. If the ``abundances``
are provided, then this method will return the weighted mean. If
``use_rms_charge`` or ``use_rms_mass`` is `True`, then this method will
return the root mean square of the charge or mass, respectively. If all
items in the |ParticleList| are the same, then this method will return
that item.
Parameters
----------
abundances : |array_like|, optional
Real numbers representing relative abundances of the particles in
the |ParticleList|. Must have the same number of elements as the
|ParticleList|. This parameter gets passed to `numpy.average` via
that function's ``weights`` parameter. If not provided, the
particles contained in the |ParticleList| are assumed to be
equally abundant.
use_rms_charge : `bool`, optional, keyword-only
If `True`, use the root mean square charge instead of the mean
charge. Defaults to `False`.
use_rms_mass : `bool`, optional, keyword-only
If `True`, use the root mean square mass instead of the mean mass.
Defaults to `False`.
Examples
--------
>>> reactants = ParticleList(["electron", "positron"])
>>> reactants.average_particle()
CustomParticle(mass=9.109383...e-31 kg, charge=0.0 C)
>>> reactants.average_particle(abundances=[1, 0.5])
CustomParticle(mass=9.109383...e-31 kg, charge=-5.34058...e-20 C)
>>> reactants.average_particle(use_rms_charge=True)
CustomParticle(mass=9.109383...e-31 kg, charge=1.6021766...-19 C)
>>> protons = ParticleList(["p+", "p+", "p+"])
>>> protons.average_particle()
Particle("p+")
"""
# If all items in the ParticleList are the same, return that item.
if len(set(self)) == 1:
return self[0]
def _average(array, weights, use_rms):
if use_rms:
return np.sqrt(np.average(array**2, weights=weights))
else:
return np.average(array, weights=weights)
new_mass = _average(self.mass, weights=abundances, use_rms=use_rms_mass)
new_charge = _average(self.charge, weights=abundances, use_rms=use_rms_charge)
return CustomParticle(mass=new_mass, charge=new_charge)
# Override the docstrings for the parent class
ParticleList.clear.__doc__ = """Remove all items from the |ParticleList|."""
ParticleList.copy.__doc__ = """Return a shallow copy of the |ParticleList|."""
ParticleList.count.__doc__ = """
Return the number of occurrences of ``item``. Here, ``item`` may be a
`~plasmapy.particles.particle_class.Particle`,
`~plasmapy.particles.particle_class.CustomParticle`, or
`~plasmapy.particles.particle_class.ParticleLike` representation of a
particle.
"""
ParticleList.extend.__doc__ = """
Extend |ParticleList| by casting
`~plasmapy.particles.particle_class.ParticleLike` items from
``iterable`` into `~plasmapy.particles.particle_class.Particle` or
`~plasmapy.particles.particle_class.CustomParticle` instances.
"""
ParticleList.index.__doc__ = """
Return first index of a `~plasmapy.particles.particle_class.ParticleLike`
value. Raise `ValueError` if the value is not present.
"""
ParticleList.pop.__doc__ = """
Remove and return item at index (default last). Raise `IndexError` if
the |ParticleList| is empty or the index is out of range.
"""
ParticleList.remove.__doc__ = """
Remove the first occurrence of a
`~plasmapy.particles.particle_class.ParticleLike` item. Raise
`ValueError` if the value is not present.
"""
ParticleList.reverse.__doc__ = """Reverse the |ParticleList| in place."""
@particle_input(any_of={"element", "isotope", "ion"})
def ionic_levels(
particle: Particle,
min_charge: Integral = 0,
max_charge: Optional[Integral] = None,
) -> ParticleList:
"""
Return a |ParticleList| that includes different ionic levels of a
base atom.
Parameters
----------
particle : `~plasmapy.particles.particle_class.ParticleLike`
Representation of an element, ion, or isotope.
min_charge : integer, optional
The starting charge number. Defaults to ``0``.
max_charge : integer, optional
The ending charge number, which will be included in the
|ParticleList|. Defaults to the atomic number.
Returns
-------
`~plasmapy.particles.particle_collections.ParticleList`
The ionic levels of the atom provided from ``min_charge`` to
``max_charge``.
Examples
--------
>>> from plasmapy.particles import ionic_levels
>>> ionic_levels("He")
ParticleList(['He 0+', 'He 1+', 'He 2+'])
>>> ionic_levels("Fe-56", min_charge=13, max_charge=15)
ParticleList(['Fe-56 13+', 'Fe-56 14+', 'Fe-56 15+'])
"""
base_particle = Particle(particle.isotope or particle.element)
if max_charge is None:
max_charge = particle.atomic_number
if not min_charge <= max_charge <= particle.atomic_number:
raise ChargeError(
f"Need min_charge ({min_charge}) "
f"≤ max_charge ({max_charge}) "
f"≤ atomic number ({base_particle.atomic_number})."
)
return ParticleList(
[Particle(base_particle, Z=Z) for Z in range(min_charge, max_charge + 1)]
)
ParticleListLike = Union[ParticleList, Sequence[ParticleLike]]
ParticleListLike.__doc__ = r"""
An `object` is :term:`particle-list-like` if it can be identified as a
`~plasmapy.particles.particle_collections.ParticleList` or cast into
one.
When used as a type hint annotation, |ParticleListLike| indicates that
the corresponding argument should represent a sequence of physical
particles. Each item in a |ParticleListLike| object must be
`~plasmapy.particles.particle_class.ParticleLike`.
Notes
-----
`~plasmapy.particles.particle_class.DimensionlessParticle` instances do
not uniquely represent a physical particle, and are thus not
|ParticleLike| and cannot be contained in a |ParticleListLike| object.
See Also
--------
~plasmapy.particles.particle_collections.ParticleList
~plasmapy.particles.particle_class.ParticleLike
~plasmapy.particles.decorators.particle_input
Examples
--------
Using |ParticleListLike| as a type hint annotation indicates that an
argument or variable should represent a sequence of |ParticleLike|
objects.
>>> from plasmapy.particles import ParticleList, ParticleListLike
>>> def contains_only_leptons(particles: ParticleListLike):
... particle_list = ParticleList(particles)
... return all(particle_list.is_category("lepton"))
>>> contains_only_leptons(["electron", "muon"])
True
"""