Clean up and rearrange

fib_test/fib_let.py

@@ -0,0 +1,11 @@
+import sys
+def fib(n):
+    if n == 0:
+        return 1
+    elif n == 1:
+        return 1
+    else:
+        r1 = fib(n-1)
+        r2 = fib(n-2)
+        return r1 + r2
+print(fib(int(sys.argv[1])))