x

test.py

@@ -0,0 +1,19 @@
+from typing import Optional
+
+
+def main():
+    # privitive
+    # int, bool, float, string
+    a = 10
+    b = 20
+
+    def sum():
+        nonlocal a
+        a = 1
+        return a + b
+
+    print("a={};sum={};a={}".format(a, sum(), a))
+
+
+if __name__ == "__main__":
+    main()