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?? __init__.py(1.58 KB)
?? __init__.pyi(14.49 KB)
?? __pycache__
?? _cmp.py(4.04 KB)
?? _cmp.pyi(318 B)
?? _compat.py(7.38 KB)
?? _config.py(514 B)
?? _funcs.py(13.08 KB)
?? _make.py(95.45 KB)
?? _next_gen.py(3.98 KB)
?? _version_info.py(2.11 KB)
?? _version_info.pyi(209 B)
?? converters.py(2.97 KB)
?? converters.pyi(382 B)
?? exceptions.py(1.9 KB)
?? exceptions.pyi(540 B)
?? filters.py(1.07 KB)
?? filters.pyi(216 B)
?? py.typed(0 B)
?? setters.py(1.4 KB)
?? setters.pyi(574 B)
?? validators.py(11.23 KB)
?? validators.pyi(1.83 KB)

Editing: _cmp.py

from __future__ import absolute_import, division, print_function

import functools

from ._compat import new_class
from ._make import _make_ne

_operation_names = {"eq": "==", "lt": "<", "le": "<=", "gt": ">", "ge": ">="}

def cmp_using(
    eq=None,
    lt=None,
    le=None,
    gt=None,
    ge=None,
    require_same_type=True,
    class_name="Comparable",
):
    """
    Create a class that can be passed into `attr.ib`'s ``eq``, ``order``, and
    ``cmp`` arguments to customize field comparison.

The resulting class will have a full set of ordering methods if
    at least one of ``{lt, le, gt, ge}`` and ``eq``  are provided.

:param Optional[callable] eq: `callable` used to evaluate equality
        of two objects.
    :param Optional[callable] lt: `callable` used to evaluate whether
        one object is less than another object.
    :param Optional[callable] le: `callable` used to evaluate whether
        one object is less than or equal to another object.
    :param Optional[callable] gt: `callable` used to evaluate whether
        one object is greater than another object.
    :param Optional[callable] ge: `callable` used to evaluate whether
        one object is greater than or equal to another object.

:param bool require_same_type: When `True`, equality and ordering methods
        will return `NotImplemented` if objects are not of the same type.

:param Optional[str] class_name: Name of class. Defaults to 'Comparable'.

See `comparison` for more details.

.. versionadded:: 21.1.0
    """

body = {
        "__slots__": ["value"],
        "__init__": _make_init(),
        "_requirements": [],
        "_is_comparable_to": _is_comparable_to,
    }

# Add operations.
    num_order_functions = 0
    has_eq_function = False

if eq is not None:
        has_eq_function = True
        body["__eq__"] = _make_operator("eq", eq)
        body["__ne__"] = _make_ne()

if lt is not None:
        num_order_functions += 1
        body["__lt__"] = _make_operator("lt", lt)

if le is not None:
        num_order_functions += 1
        body["__le__"] = _make_operator("le", le)

if gt is not None:
        num_order_functions += 1
        body["__gt__"] = _make_operator("gt", gt)

if ge is not None:
        num_order_functions += 1
        body["__ge__"] = _make_operator("ge", ge)

type_ = new_class(class_name, (object,), {}, lambda ns: ns.update(body))

# Add same type requirement.
    if require_same_type:
        type_._requirements.append(_check_same_type)

# Add total ordering if at least one operation was defined.
    if 0 < num_order_functions < 4:
        if not has_eq_function:
            # functools.total_ordering requires __eq__ to be defined,
            # so raise early error here to keep a nice stack.
            raise ValueError(
                "eq must be define is order to complete ordering from "
                "lt, le, gt, ge."
            )
        type_ = functools.total_ordering(type_)

return type_

def _make_init():
    """
    Create __init__ method.
    """

def __init__(self, value):
        """
        Initialize object with *value*.
        """
        self.value = value

return __init__

def _make_operator(name, func):
    """
    Create operator method.
    """

def method(self, other):
        if not self._is_comparable_to(other):
            return NotImplemented

result = func(self.value, other.value)
        if result is NotImplemented:
            return NotImplemented

return result

method.__name__ = "__%s__" % (name,)
    method.__doc__ = "Return a %s b.  Computed by attrs." % (
        _operation_names[name],
    )

return method

def _is_comparable_to(self, other):
    """
    Check whether `other` is comparable to `self`.
    """
    for func in self._requirements:
        if not func(self, other):
            return False
    return True

def _check_same_type(self, other):
    """
    Return True if *self* and *other* are of the same type, False otherwise.
    """
    return other.value.__class__ is self.value.__class__

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