diff --git a/aula141/log.py b/aula141/log.py
new file mode 100644
index 0000000..8c51f1b
--- /dev/null
+++ b/aula141/log.py
@@ -0,0 +1,14 @@
+# Abstração
+class Log:
+    def log(self, msg):
+        raise NotImplementedError('Implemente o método log')
+
+
+class LogFileMixin(Log):
+    def log(self, msg):
+        print(msg)
+
+
+if __name__ == '__main__':
+    l = LogFileMixin()
+    l.log('qualquer coisa')
diff --git a/aula141/main.py b/aula141/main.py
new file mode 100644
index 0000000..4e7964e
--- /dev/null
+++ b/aula141/main.py
@@ -0,0 +1 @@
+from log import Log