### 81.2 Functions in pytranslate

Function: pytranslate (expr, [print-ir])

  Translates the expression expr to equivalent python3 statements. Output is printed in the stdout.

  Example:

      (%i1) load ("pytranslate")$

      (%i2) pytranslate('(for i:8 step -1 unless i<3 do (print(i))));
      (%o2)
      v["i"] = 8
      while not((v["i"] < 3)):
          m["print"](v["i"])
          v["i"] = (v["i"] + -1)
      del v["i"]

  expr is evaluated, and the return value is used for translation. Hence, for statements like assignment, it might be useful to quote the statement:

      (%i1) load ("pytranslate")$

      (%i2) pytranslate(x:20);
      (%o2)
      20

      (%i3) pytranslate('(x:20));
      (%o3)
      v["x"] = 20

  Passing the optional parameter (print-ir) to `pytranslate` as t, will print the internal IR representation of `expr` and return the translated python3 code.

      (%i1) load("pytranslate");
      (%o1) pytranslate

      (%i2) pytranslate('(plot3d(lambda([x, y], x^2+y^(-1)), [x, 1, 10],
                         [y, 1, 10])), t);
      (body
       (funcall (element-array "m" (string "plot3d"))
                (lambda
                    ((symbol "x") (symbol "y")
                     (op-no-bracket
                      =
                      (symbol "v")
                      (funcall (symbol "stack") (dictionary) (symbol "v"))))
                  (op +
                      (funcall (element-array (symbol "m") (string "pow"))
                               (symbol "x") (num 2 0))
                      (funcall (element-array (symbol "m") (string "pow"))
                               (symbol "y") (unary-op - (num 1 0)))))
                (struct-list (string "x") (num 1 0) (num 10 0))
                (struct-list (string "y") (num 1 0) (num 10 0))))
      (%o2)
      m["plot3d"](lambda x, y, v = Stack({}, v): (m["pow"](x, 2) + m["\
      pow"](y, (-1))), ["x", 1, 10], ["y", 1, 10])

Function: show_form (expr)

  Displays the internal maxima form of `expr`

      (%i4) show_form(a^b);
      ((mexpt) $a $b)
      (%o4) a^b