Python’s range() analog in Common Lisp

There is no built-in way of generating a sequence of numbers, the canonical way of doing so is to do one of:

• Use loop
• Write a utility function that uses loop

An example implementation would be (this only accepts counting “from low” to “high”):

(defun range (max &key (min 0) (step 1))
   (loop for n from min below max by step
      collect n))

This allows you to specify an (optional) minimum value and an (optional) step value.

To generate odd numbers: (range 10 :min 1 :step 2)