Emacs Lisp（elisp）中的范围数据类型或生成器？

Question

elisp对Python的range(start, end, [step])等效什么？

Answer 1

number-sequence与python的range类似，但它的输出是完全不同的。 例如：

(number-sequence 5) 
=> (5) 
(number-sequence 1 5) 
=> (1 2 3 4 5) 
(number-sequence 1 5 2) 
=> (1 3 5) 

我用这个功能给我从Python的range这样的输出：

(defun py-range (start &optional end step) 
    (unless end 
    (setq end start 
     start 0)) 
    (number-sequence start (1- end) step)) 

现在一切正常：

(py-range 5) 
=> (0 1 2 3 4) 
(py-range 1 5) 
=> (1 2 3 4) 
(py-range 1 5 2) 
=> (1 3) 

Answer 2

(number-sequence FROM &optional TO INC)