Python curses不接受curses.KEY_UP作爲輸入

Question

我需要你的幫助來理解我的基於新菜單的python程序中的錯誤。

我使用curses庫創建了一個基於菜單的python。通過接受包括特殊鍵在內的所有按鍵作爲輸入時，該程序對主菜單選項正常工作，當通過getch()獲得用戶輸入時，但是通過子菜單列表，它無法接受特殊鍵作爲輸入。

# Increment or Decrement 
     elif c == curses.KEY_DOWN: # down arrow 
      if self.option < len(self.submenu): 
       self.option += 1 
      else: self.option = 0 
     elif c == curses.KEY_UP: # up arrow 
      if self.option > 0: 
       self.option -= 1 
      else: self.option = len(self.submenu) 

所以上面的是我使用來選擇該選項的條件，但沒有輸入發送當我使用上/下箭頭鍵

我分享以下

我的全部代碼詛咒

import curses, os, traceback, json 


file1 = json.loads(open('/etc/ansible/org/json/tag_definition.json').read()) 
submenu = list(file1.keys()) 

cfg_dict = {'InstanceName': 'NONE', 
      'Environment': 'NONE', 
      'InstanceType':'t2.micro', 
      'SystemOwner':'1', 
     'LifeCycle':'NONE', 
     'DeptName':'NONE', 
     'Org':'NONE'} 



class CursedMenu(object): 
    '''A class which abstracts the horrors of building a curses-based menu system''' 
    def __init__(self): 
     '''Initialization''' 
     self.screen = curses.initscr() 
     curses.noecho() 
     curses.cbreak() 
     curses.start_color() 
     self.screen.keypad(1) 

     # Highlighted and Normal line definitions 
     curses.init_pair(1, curses.COLOR_BLACK, curses.COLOR_WHITE) 
     self.highlighted = curses.color_pair(1) 
     self.normal = curses.A_NORMAL 


    def show(self, options, title="Title", subtitle="Subtitle"): 
     '''Draws a menu with the given parameters''' 
     self.set_options(options) 
     self.title = title.upper() 
     self.subtitle = subtitle.upper() 
     self.selected = 0 
     self.draw_menu() 


    def set_options(self, options): 
     '''Validates that the last option is "Exit"''' 
     if options[-1] is not 'Exit': 
      options.append('Exit') 
     self.options = options 

    def set_submenu(self, submenu): 
     '''Validates that the last option is "Exit"''' 
     if submenu[-1] is not 'Exit': 
      submenu.append('Exit') 
     self.submenu = submenu 

    def draw_dict(self): 
     self.screen.addstr(8, 35, " "*43, curses.A_BOLD) 
     self.screen.addstr(10, 35," "*43, curses.A_BOLD) 
     self.screen.addstr(12, 35," "*43, curses.A_BOLD) 
     self.screen.addstr(14, 35," "*43, curses.A_BOLD) 
     self.screen.addstr(16, 35," "*43, curses.A_BOLD) 
     self.screen.addstr(18, 35," "*43, curses.A_BOLD) 
     self.screen.addstr(20, 35," "*43, curses.A_BOLD) 
     self.screen.addstr(8, 35, cfg_dict['InstanceName'], curses.A_STANDOUT) 
     self.screen.addstr(10, 35,cfg_dict['Environment'], curses.A_STANDOUT) 
     self.screen.addstr(12, 35,cfg_dict['InstanceType'], curses.A_STANDOUT) 
     self.screen.addstr(14, 35,cfg_dict['SystemOwner'], curses.A_STANDOUT) 
     self.screen.addstr(16, 35,cfg_dict['LifeCycle'], curses.A_STANDOUT) 
     self.screen.addstr(18, 35,cfg_dict['DeptName'], curses.A_STANDOUT) 
     self.screen.addstr(20, 35,cfg_dict['Org'], curses.A_STANDOUT) 
     self.screen.refresh() 

    def draw_menu(self): 
     '''Actually draws the menu and handles branching''' 
     request = "" 
     try: 
      while request is not "Exit": 
       self.draw() 
       request = self.get_user_input() 
       self.handle_request(request) 
      self.__exit__() 

     # Also calls __exit__, but adds traceback after 
     except Exception as exception: 
      self.__exit__() 
      traceback.print_exc() 


    def draw(self): 
     '''Draw the menu and lines''' 
     #self.screen.border(0) 
     self.screen.subwin(40, 80, 0, 0).box() 
     self.screen.addstr(2,30, self.title, curses.A_STANDOUT|curses.A_BOLD) # Title for this menu 
     self.screen.hline(3, 1, curses.ACS_HLINE, 78) 
     self.screen.addstr(4,2, self.subtitle, curses.A_BOLD) #Subtitle for this menu 
     # Display all the menu items, showing the 'pos' item highlighted 
     left = 2 
     for index in range(len(self.options)): 
      menu_name = len(self.options[index]) 
      textstyle = self.normal 
      if index == self.selected: 
       textstyle = self.highlighted 
      self.screen.addstr(5, left, "%d.%s" % (index+1, self.options[index]), textstyle) 
      left = left + menu_name + 3 
     self.screen.addstr(8, 4, "    Instance Name:", curses.A_BOLD) 
     self.screen.addstr(10, 4,"     Environment:", curses.A_BOLD) 
     self.screen.addstr(12, 4,"    Instance Type:", curses.A_BOLD) 
     self.screen.addstr(14, 4,"     SystemOwner:", curses.A_BOLD) 
     self.screen.addstr(16, 4,"     LifeCycle:", curses.A_BOLD) 
     self.screen.addstr(18, 4,"    Department Name:", curses.A_BOLD) 
     self.screen.addstr(20, 4,"       Org:", curses.A_BOLD) 
     self.draw_dict() 
     self.screen.refresh() 

    def get_user_input(self): 
     '''Gets the user's input and acts appropriately''' 
     user_in = self.screen.getch() # Gets user input 

     '''Enter and Exit Keys are special cases''' 
     if user_in == 10: 
      return self.options[self.selected] 
     if user_in == 27: 
      return self.options[-1] 
     if user_in == (curses.KEY_END, ord('!')): 
      return self.options[-1] 

     # This is a number; check to see if we can set it 
     if user_in >= ord('1') and user_in <= ord(str(min(9,len(self.options)+1))): 
      self.selected = user_in - ord('0') - 1 # convert keypress back to a number, then subtract 1 to get index 
      return 

     # Increment or Decrement 
     if user_in == curses.KEY_LEFT: # left arrow 
      self.selected -=1 
     if user_in == curses.KEY_RIGHT: # right arrow 
      self.selected +=1 
     self.selected = self.selected % len(self.options) 
     return 



    def handle_request(self, request): 
     '''This is where you do things with the request''' 
     if request is "Org": 
      self.org_func() 
     if request is None: return 

    def org_func(self): 
     '''Actually draws the submenu and handles branching''' 
     c = None 
     self.option = 0 
     self.set_submenu(submenu) 
     height = len(self.submenu) 
     while c != 10: 
      self.s = curses.newwin(height+2, 20, 6, 14) 
      self.s.box() 
      for index in range(len(self.submenu)): 
       textstyle = self.normal 
       if index == self.option: 
        textstyle = self.highlighted 
       self.s.addstr(index+1,1, "%d-%s" % (index+1, self.submenu[index]), textstyle) 
      self.s.refresh() 
      c = self.s.getch() # Gets user input 
      if c == ord('k'): 
       d = self.submenu[self.option] 
       cfg_dict['Org'] = file1[d]['Org'] 
     # This is a number; check to see if we can set it 
      if c >= ord('1') and c <= ord(str(len(self.submenu)+1)): 
       self.option = c - ord('0') - 1 # convert keypress back to a number, then subtract 1 to get index 
     # Increment or Decrement 
      elif c == curses.KEY_DOWN: # down arrow 
       if self.option < len(self.submenu): 
        self.option += 1 
       else: self.option = 0 
      elif c == curses.KEY_UP: # up arrow 
       if self.option > 0: 
        self.option -= 1 
       else: self.option = len(self.submenu) 
     return self.option 

    def __exit__(self): 
     curses.endwin() 
     os.system('clear') 


'''demo''' 
cm = CursedMenu() 
cm.show(['Instance-ID','Org','Tag'], title='Instance Launch', subtitle='Options') 

如果我使用字母和數字作爲輸入，但不使用特殊鍵，它的工作原理非常好。我已經使用下面的代碼，它正在工作

elif c == ord('k'): # down arrow 
     if self.option < len(self.submenu): 
      self.option += 1 
     else: self.option = 0 
    elif c == ord('i'): # up arrow 
     if self.option > 0: 
      self.option -= 1 
     else: self.option = len(self.submenu) 

請幫助理解爲什麼代碼不接受特殊鍵。

下面是我用

{ 

    "Dept1": { 

     "Instance Name": "instance1", 

     "Environment": "environment1", 

     "SystemOwner": "Owner1", 

     "LifeCycle": "Lcy1", 

     "DeptName": "Check1", 

     "Org": "CSO" 

    } 
} 

Answer 1

當你沒有輸入JSON

self.s = curses.newwin(height+2, 20, 6, 14) 

你省略了新的窗口設置屬性，例如，

self.s.keypad(1)