Initial commit. Basic models mostly done.

venv/lib/python3.8/site-packages/django/db/models/enums.py

@@ -0,0 +1,82 @@
+import enum
+
+from django.utils.functional import Promise
+
+__all__ = ['Choices', 'IntegerChoices', 'TextChoices']
+
+
+class ChoicesMeta(enum.EnumMeta):
+    """A metaclass for creating a enum choices."""
+
+    def __new__(metacls, classname, bases, classdict):
+        labels = []
+        for key in classdict._member_names:
+            value = classdict[key]
+            if (
+                isinstance(value, (list, tuple)) and
+                len(value) > 1 and
+                isinstance(value[-1], (Promise, str))
+            ):
+                *value, label = value
+                value = tuple(value)
+            else:
+                label = key.replace('_', ' ').title()
+            labels.append(label)
+            # Use dict.__setitem__() to suppress defenses against double
+            # assignment in enum's classdict.
+            dict.__setitem__(classdict, key, value)
+        cls = super().__new__(metacls, classname, bases, classdict)
+        cls._value2label_map_ = dict(zip(cls._value2member_map_, labels))
+        # Add a label property to instances of enum which uses the enum member
+        # that is passed in as "self" as the value to use when looking up the
+        # label in the choices.
+        cls.label = property(lambda self: cls._value2label_map_.get(self.value))
+        cls.do_not_call_in_templates = True
+        return enum.unique(cls)
+
+    def __contains__(cls, member):
+        if not isinstance(member, enum.Enum):
+            # Allow non-enums to match against member values.
+            return member in {x.value for x in cls}
+        return super().__contains__(member)
+
+    @property
+    def names(cls):
+        empty = ['__empty__'] if hasattr(cls, '__empty__') else []
+        return empty + [member.name for member in cls]
+
+    @property
+    def choices(cls):
+        empty = [(None, cls.__empty__)] if hasattr(cls, '__empty__') else []
+        return empty + [(member.value, member.label) for member in cls]
+
+    @property
+    def labels(cls):
+        return [label for _, label in cls.choices]
+
+    @property
+    def values(cls):
+        return [value for value, _ in cls.choices]
+
+
+class Choices(enum.Enum, metaclass=ChoicesMeta):
+    """Class for creating enumerated choices."""
+
+    def __str__(self):
+        """
+        Use value when cast to str, so that Choices set as model instance
+        attributes are rendered as expected in templates and similar contexts.
+        """
+        return str(self.value)
+
+
+class IntegerChoices(int, Choices):
+    """Class for creating enumerated integer choices."""
+    pass
+
+
+class TextChoices(str, Choices):
+    """Class for creating enumerated string choices."""
+
+    def _generate_next_value_(name, start, count, last_values):
+        return name