feat: add functions

functions.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python3
+
+do_add = lambda a, b: a + b
+
+def do_add_2(a, b):
+    return a + b
+
+def incr(base, inc = 1):
+    return base + inc
+
+def var_args(first_arg = "first", *args):
+    print("fist arg:", first_arg)
+    print("rest args:", args)
+
+if __name__ == "__main__":
+    print("1 + 2 =", do_add(1, 2))
+    print("1 + 2 =", do_add_2(1, 2))
+    print("1 inc 1 =", incr(1))
+    print("1 inc 1 =", incr(1, inc = 1))
+    print("1 inc 2 =", incr(1, inc = 2))
+    var_args()
+    var_args("fist argument", "1", "2", "3")