+ etc

my_range_gen_3.py

@@ -0,0 +1,24 @@
+from operator import gt, lt
+
+
+def my_range_gen(start, stop=None, step=1):
+    if stop is None:
+        start, stop = 0, start
+
+    if (
+        not step
+        or start == stop
+        or (step > 0 and start > stop)
+        or (step < 0 and start < stop)
+    ):
+        return
+
+    x, op = start, start > stop and gt or lt
+    while op(x, stop):
+        yield x
+        x += step
+
+
+for i in my_range_gen(20, 10, 3):
+    print(i)
+print("End")