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attr
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__init__.py
(1.13 KB)
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__pycache__
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_compat.py
(4.19 KB)
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_config.py
(514 B)
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_funcs.py
(7.71 KB)
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_make.py
(48.14 KB)
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converters.py
(531 B)
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exceptions.py
(1.08 KB)
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filters.py
(1.12 KB)
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validators.py
(4.84 KB)
Editing: _funcs.py
from __future__ import absolute_import, division, print_function import copy from ._compat import iteritems from ._make import NOTHING, _obj_setattr, fields from .exceptions import AttrsAttributeNotFoundError def asdict(inst, recurse=True, filter=None, dict_factory=dict, retain_collection_types=False): """ Return the ``attrs`` attribute values of *inst* as a dict. Optionally recurse into other ``attrs``-decorated classes. :param inst: Instance of an ``attrs``-decorated class. :param bool recurse: Recurse into classes that are also ``attrs``-decorated. :param callable filter: A callable whose return code determines whether an attribute or element is included (``True``) or dropped (``False``). Is called with the :class:`attr.Attribute` as the first argument and the value as the second argument. :param callable dict_factory: A callable to produce dictionaries from. For example, to produce ordered dictionaries instead of normal Python dictionaries, pass in ``collections.OrderedDict``. :param bool retain_collection_types: Do not convert to ``list`` when encountering an attribute whose type is ``tuple`` or ``set``. Only meaningful if ``recurse`` is ``True``. :rtype: return type of *dict_factory* :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs`` class. .. versionadded:: 16.0.0 *dict_factory* .. versionadded:: 16.1.0 *retain_collection_types* """ attrs = fields(inst.__class__) rv = dict_factory() for a in attrs: v = getattr(inst, a.name) if filter is not None and not filter(a, v): continue if recurse is True: if has(v.__class__): rv[a.name] = asdict(v, recurse=True, filter=filter, dict_factory=dict_factory) elif isinstance(v, (tuple, list, set)): cf = v.__class__ if retain_collection_types is True else list rv[a.name] = cf([ asdict(i, recurse=True, filter=filter, dict_factory=dict_factory) if has(i.__class__) else i for i in v ]) elif isinstance(v, dict): df = dict_factory rv[a.name] = df(( asdict(kk, dict_factory=df) if has(kk.__class__) else kk, asdict(vv, dict_factory=df) if has(vv.__class__) else vv) for kk, vv in iteritems(v)) else: rv[a.name] = v else: rv[a.name] = v return rv def astuple(inst, recurse=True, filter=None, tuple_factory=tuple, retain_collection_types=False): """ Return the ``attrs`` attribute values of *inst* as a tuple. Optionally recurse into other ``attrs``-decorated classes. :param inst: Instance of an ``attrs``-decorated class. :param bool recurse: Recurse into classes that are also ``attrs``-decorated. :param callable filter: A callable whose return code determines whether an attribute or element is included (``True``) or dropped (``False``). Is called with the :class:`attr.Attribute` as the first argument and the value as the second argument. :param callable tuple_factory: A callable to produce tuples from. For example, to produce lists instead of tuples. :param bool retain_collection_types: Do not convert to ``list`` or ``dict`` when encountering an attribute which type is ``tuple``, ``dict`` or ``set``. Only meaningful if ``recurse`` is ``True``. :rtype: return type of *tuple_factory* :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs`` class. .. versionadded:: 16.2.0 """ attrs = fields(inst.__class__) rv = [] retain = retain_collection_types # Very long. :/ for a in attrs: v = getattr(inst, a.name) if filter is not None and not filter(a, v): continue if recurse is True: if has(v.__class__): rv.append(astuple(v, recurse=True, filter=filter, tuple_factory=tuple_factory, retain_collection_types=retain)) elif isinstance(v, (tuple, list, set)): cf = v.__class__ if retain is True else list rv.append(cf([ astuple(j, recurse=True, filter=filter, tuple_factory=tuple_factory, retain_collection_types=retain) if has(j.__class__) else j for j in v ])) elif isinstance(v, dict): df = v.__class__ if retain is True else dict rv.append(df( ( astuple( kk, tuple_factory=tuple_factory, retain_collection_types=retain ) if has(kk.__class__) else kk, astuple( vv, tuple_factory=tuple_factory, retain_collection_types=retain ) if has(vv.__class__) else vv ) for kk, vv in iteritems(v))) else: rv.append(v) else: rv.append(v) return rv if tuple_factory is list else tuple_factory(rv) def has(cls): """ Check whether *cls* is a class with ``attrs`` attributes. :param type cls: Class to introspect. :raise TypeError: If *cls* is not a class. :rtype: :class:`bool` """ return getattr(cls, "__attrs_attrs__", None) is not None def assoc(inst, **changes): """ Copy *inst* and apply *changes*. :param inst: Instance of a class with ``attrs`` attributes. :param changes: Keyword changes in the new copy. :return: A copy of inst with *changes* incorporated. :raise attr.exceptions.AttrsAttributeNotFoundError: If *attr_name* couldn't be found on *cls*. :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs`` class. .. deprecated:: 17.1.0 Use :func:`evolve` instead. """ import warnings warnings.warn("assoc is deprecated and will be removed after 2018/01.", DeprecationWarning, stacklevel=2) new = copy.copy(inst) attrs = fields(inst.__class__) for k, v in iteritems(changes): a = getattr(attrs, k, NOTHING) if a is NOTHING: raise AttrsAttributeNotFoundError( "{k} is not an attrs attribute on {cl}." .format(k=k, cl=new.__class__) ) _obj_setattr(new, k, v) return new def evolve(inst, **changes): """ Create a new instance, based on *inst* with *changes* applied. :param inst: Instance of a class with ``attrs`` attributes. :param changes: Keyword changes in the new copy. :return: A copy of inst with *changes* incorporated. :raise TypeError: If *attr_name* couldn't be found in the class ``__init__``. :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs`` class. .. versionadded:: 17.1.0 """ cls = inst.__class__ attrs = fields(cls) for a in attrs: if not a.init: continue attr_name = a.name # To deal with private attributes. init_name = attr_name if attr_name[0] != "_" else attr_name[1:] if init_name not in changes: changes[init_name] = getattr(inst, attr_name) return cls(**changes)
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