Question

我正在使用Python 3.x制作非商业的CLI程序，它具有一个主菜单和一个位于主菜单下方的子菜单。为了成为一个可用的程序，我想制作简单的键盘事件处理程序，我尝试了两个不同的程序包（pynput和键盘），但是我遇到了类似的问题。假设程序具有如下主菜单：

main_menu = ['Show existing URLs',
         'Add new URL',
         'Update URL',
         'Delete URL',
         'Quit'
         ]

通常，程序有两个不同的文件，但是我在这里合并它们，我在上面显示菜单，如下所示：

import keyboard
def show_urls():
    msg_show_urls = 'Pres any key to continue'
    for index, link in enumerate(existing_urls()):
        print(index+1, '\t', link)
    print(msg_show_urls)
    return any_key()    

def add_new_url():
    pass


def update_url():
    pass


def del_url():
    pass


def terminate():
    pass     

active_functions = [show_urls, add_new_url, update_url, del_url, terminate]


def program():
    procedures = {key+1: value for key, value in enumerate(active_functions)}
    i_message = "Please specify the action you would like to do with the number to the left of it: "
    while True:
        show_menu(main_menu)
        procedures[make_selection(main_menu, len(main_menu),
                                       input(i_message))]()


def show_menu(menu):
    for index, item in enumerate(menu):
        print(index+1, '\t', item)


def make_selection(active_menu, menu_length, selection=""):

    wrong_choice = False
    wc_str = 'Please specify the action you would like to do with the number to the left of it'
    while True:
        if not selection == "":
            if selection.isnumeric():
                try:
                    if not wrong_choice:
                        selection = int(selection)
                        if selection < 1 or selection > menu_length:
                            wrong_choice = True
                            selection = str(selection)
                            continue
                    else:
                        show_menu(active_menu)
                        print(wc_str)
                        selection = input('Action you would like to do: ')
                        wrong_choice = False
                        continue
                except ValueError:
                    wrong_choice = True
                    continue
                else:
                    return selection
            else:
                show_menu(active_menu)
                print(wc_str)
                selection = input('Action you would like to do: ')
                continue
        else:
            show_menu(active_menu)
            print('Entry can not be empty')
            selection = input('Action you would like to do: ')
            continue


def existing_urls():
    return urls


# Keyboard handlers start
def any_key():
    try:
        keyboard.read_key()
        print('\r\r')
    except Exception as e:
        print(e) # Give error code

def yes_no():
    selections = ['y', 'Y', 'n', 'N']
    with keyboard.Events() as events:
        # print(events)
        for event in events:
            print(event)


# Keyboard handlers finish

# CONS AND VAR

# Program main menu
main_menu = ['Show existing URLs',
         'Add new URL',
         'Update URL',
         'Delete URL',
         'Quit'
         ]
# URLS
urls = [
    'http://stackoverflow.com/',
    'https://www.wikipedia.org/',
    'https://www.google.com/'
] 

if __name__ == '__main__':
    program()

这是我目前的全部代码，如果对您来说它看起来很长或杂乱无章，请不要卡在上面。当我运行此代码并选择1时，然后按Enter键，它会向我显示URL，但不等我按任何键，它会按两次Enter键，或者如果我按了另一个键，这次它将写我按下的键（我假设我可以抓住它）。因此，我尝试了一些我导入time模块并在any_key()函数中的行之间放置一个sleep命令的事情：

def any_key():
time.sleep(0.2)
try:
    keyboard.read_key()
    print('\r\r')
except Exception as e:
    print(e)  # Give error code

它开始等待我，但是如果我再次按下Enter键，它将按下两次Enter键，我也尝试使用keyboard.send()方法发送不同的键，但是结果是相同的。并且使用sleep()函数并非每次都有效。我该怎么做才能使其正常工作？

Python CLI键盘事件处理程序

0 个答案: