Method length

Singular/dyn_modules/python/interpreter_support.cc:86–96

    return res;
  }
  int length()
  {
    leftv v=args;
    int l=0;
    while(v!=NULL)
    {
      l++;
      v=v->next;
    }
    return l;
  }
  void appendPoly(const Poly& p)
  {
    leftv v=initArg();