diff --git a/aula90.py b/aula90.py
new file mode 100644
index 0000000..6f8d97f
--- /dev/null
+++ b/aula90.py
@@ -0,0 +1,15 @@
+import sys
+
+# Generator expression, Iterables e Iterators em Python
+iterable = ['Eu', 'Tenho', '__iter__']
+iterator = iter(iterable)  # tem __iter__ e __next__
+lista = [n for n in range(1000000)]
+generator = (n for n in range(1000000))
+
+print(sys.getsizeof(lista))
+print(sys.getsizeof(generator))
+
+print(generator)
+
+# for n in generator:
+#     print(n)