From 8869d5ba5a3d6987b7133a8e994a56b6fd7f45d9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luiz=20Ot=C3=A1vio?= <luizomf@gmail.com>
Date: Tue, 29 Nov 2022 10:23:00 -0300
Subject: [PATCH] =?UTF-8?q?C=C3=B3digo:=20Metaclasses=20s=C3=A3o=20o=20tip?=
 =?UTF-8?q?o=20das=20classes?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 aula155.py | 51 ++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 42 insertions(+), 9 deletions(-)

diff --git a/aula155.py b/aula155.py
index 5eac407..45f5a62 100644
--- a/aula155.py
+++ b/aula155.py
@@ -22,14 +22,47 @@
 # com certeza que precisam delas e não precisam de uma explicação
 # sobre o porquê)."
 # — Tim Peters (CPython Core Developer)
-
-# object acima
-# class Foo:
-#     ...
+def meu_repr(self):
+    return f'{type(self).__name__}({self.__dict__})'
 
 
-Foo = type('Foo', (object,), {})
-f = Foo()
-# print(isinstance(f, Foo))
-print(type(f))
-print(type(Foo))
+class Meta(type):
+    def __new__(mcs, name, bases, dct):
+        print('METACLASS NEW')
+        cls = super().__new__(mcs, name, bases, dct)
+        cls.attr = 1234
+        cls.__repr__ = meu_repr
+
+        if 'falar' not in cls.__dict__ or \
+                not callable(cls.__dict__['falar']):
+            raise NotImplementedError('Implemente falar')
+
+        return cls
+
+    def __call__(cls, *args, **kwargs):
+        instancia = super().__call__(*args, **kwargs)
+
+        if 'nome' not in instancia.__dict__:
+            raise NotImplementedError('Crie o attr nome')
+
+        return instancia
+
+
+class Pessoa(metaclass=Meta):
+    # falar = 123
+
+    def __new__(cls, *args, **kwargs):
+        print('MEU NEW')
+        instancia = super().__new__(cls)
+        return instancia
+
+    def __init__(self, nome):
+        print('MEU INIT')
+        # self.nome = nome
+
+    def falar(self):
+        print('FALANDO...')
+
+
+p1 = Pessoa('Luiz')
+p1.falar()