[编程交流] 替代，帮助。

(setq elist (subst (cons 1 xxx (assoc 1 elist) elist))
(entmod elist)

_$ (setq ss (ssget ":L" '((0 . "LWPOLYLINE"))))
<Selection set: 14>
_$ (setq dxf (entget (ssname ss 0)))
((-1 . <Entity name: 7ee38410>) 
(0 . "LWPOLYLINE") 
(330 . <Entity name: 7ee36cf8>) 
(5 . "1F2") 
(100 . "AcDbEntity") 
(67 . 0) 
(410 . "Model") 
(8 . "0") 
(100 . "AcDbPolyline")
(90 . 6) 
(70 . 0)
(43 . 0.0) 
(38 . 0.0)
(39 . 0.0)
(10 1595.13 1006.01) ;;[color="red"]1[/color]
(40 . 0.0) 
(41 . 0.0) 
(42 . 0.0)
(91 . 0)
(10 1860.27 1131.24) ;;[color="red"]2[/color]
(40 . 0.0) 
(41 . 0.0)
(42 . 0.0)
(91 . 0) 
(10 1964.18 930.87) ;;[color="red"]3[/color]
(40 . 0.0)
(41 . 0.0) 
(42 . 0.0) 
(91 . 0) 
(10 2343.98 1038.21);; [color="red"]4[/color]
(40 . 0.0)
(41 . 0.0) 
(42 . 0.0) 
(91 . 0) 
(10 2562.54 877.199);; [color="red"]5[/color]
(40 . 0.0)
(41 . 0.0) 
(42 . 0.0) 
(91 . 0) 
(10 2720.19 1002.43) ;; [color="red"]6[/color]
(40 . 0.0) 
(41 . 0.0) 
(42 . 0.0) 
(91 . 0) 
(210 0.0 0.0 1.0))

(setq elist (subst (cons 10 xxx) (nth 1 (acet-list-m-assoc 10 elist)) elist))
(entmod elist)

[b][color=BLACK]([/color][/b]setq en [b][color=FUCHSIA]([/color][/b]entlast[b][color=FUCHSIA])[/color][/b]
     np '[b][color=FUCHSIA]([/color][/b]7.5 6.5[b][color=FUCHSIA])[/color][/b][b][color=BLACK])[/color][/b]
[b][color=BLACK]([/color][/b]nw_elwp en 3 np[b][color=BLACK])[/color][/b]
[b][color=BLACK]([/color][/b]defun nw_elwp [b][color=FUCHSIA]([/color][/b]e v np / ed i[b][color=FUCHSIA])[/color][/b]
 [b][color=FUCHSIA]([/color][/b]setq ed [b][color=NAVY]([/color][/b]entget e[b][color=NAVY])[/color][/b][b][color=FUCHSIA])[/color][/b]
 [b][color=FUCHSIA]([/color][/b]setq i 1[b][color=FUCHSIA])[/color][/b]
 [b][color=FUCHSIA]([/color][/b]foreach g ed
   [b][color=NAVY]([/color][/b]cond [b][color=MAROON]([/color][/b][b][color=GREEN]([/color][/b]and [b][color=BLUE]([/color][/b]= 10 [b][color=RED]([/color][/b]car g[b][color=RED])[/color][/b][b][color=BLUE])[/color][/b]
               [b][color=BLUE]([/color][/b]= i v[b][color=BLUE])[/color][/b][b][color=GREEN])[/color][/b]
          [b][color=GREEN]([/color][/b]entmod [b][color=BLUE]([/color][/b]subst [b][color=RED]([/color][/b]cons 10 np[b][color=RED])[/color][/b] g ed[b][color=BLUE])[/color][/b][b][color=GREEN])[/color][/b]
          [b][color=GREEN]([/color][/b]setq i [b][color=BLUE]([/color][/b]1+ i[b][color=BLUE])[/color][/b][b][color=GREEN])[/color][/b][b][color=MAROON])[/color][/b]
         [b][color=MAROON]([/color][/b][b][color=GREEN]([/color][/b]= 10 [b][color=BLUE]([/color][/b]car g[b][color=BLUE])[/color][/b][b][color=GREEN])[/color][/b]
          [b][color=GREEN]([/color][/b]setq i [b][color=BLUE]([/color][/b]1+ i[b][color=BLUE])[/color][/b][b][color=GREEN])[/color][/b][b][color=MAROON])[/color][/b][b][color=NAVY])[/color][/b][b][color=FUCHSIA])[/color][/b]
np[b][color=BLACK])[/color][/b]

(defun substnthkey ( n k v l )
   (if (assoc k l)
       (if (= k (caar l))
           (if (zerop n)
               (cons (cons k v) (cdr l))
               (cons (car l) (substnthkey (1- n) k v (cdr l)))
           )
           (cons (car l) (substnthkey n k v (cdr l)))
       )
       l
   )
)

_$ (substnthkey 2 10 "new" '((10 . "a") (11 . "b") (10 . "c") (11 . "d") (10 . "e") (11 . "f")))
((10 . "a") (11 . "b") (10 . "c") (11 . "d") (10 . "new") (11 . "f"))