Question

我想要做的是从用户那里获取特定输入，如果输入与规格不匹配，则打印错误消息几秒钟并使其消失并再次获得输入。例如：下面我想从用户那里获取字符串并将其存储在名为“name”的变量中。字符串的长度必须不超过15.因此，如果用户提供长度为20的字符串，我想打印'TOO LONG！（MAX：15）'，但在此之后的新提示开始（因为循环）。如果用户继续提供太长的字符串，则会越来越多。所以我想打印'TOO LONG！（MAX：15）'一次，让它在几秒钟后消失，让用户回到上方提示。这是我想要做的地方：

def get_contact():
    try:
        while True:
            name = input('\033[1m\nNAME: \033[0m')
            if name.isalpha():
                if len(name) > 16:
                    print('\033[91m\033[1mTOO LONG!(MAX:15)\033[0m\033[0m')
                    continue
                break
            else:
                print('\033[91m\033[1mALPHABETICAL CHARACTORS ONLY!\033[0m\
                    \033[0m')
        while True:
            number = input('\033[1m\nNUMBER: \033[0m')
            if number.isnumeric():
                if len(number) > 16:
                    print('\033[91m\033[1mTOO LONG!(MAX:15)\033[0m\033[0m')
                    continue
                break
            else:
                print('\033[91m\033[1mNUMBERS ONLY!\033[0m\033[0m')
    except EOFError:
        print('\033[1m\n\nYOU CANCELED THE OPERATION!\033[0m')
        time.sleep(1)
        main_view()
    except KeyboardInterrupt:
        time.sleep(1)
        os.system('clear')
        exit(0)

    return name, number

完整脚本：

import pickle, os, shutil, time

window_width, window_height = shutil.get_terminal_size()

def header():
    os.system('clear')

    line = '=' * window_width
    welcome = 'PHONEBOOK'.center(window_width)
    print('\033[1m{0}\n{1}\n{0}\033[0m\n'.format(line, welcome))

def main_view():
    header()
    data = None
    try:
        data = open('phonebook.data', 'rb')
        phonebook = pickle.load(data)
    except FileNotFoundError:
        phonebook = {}

    if phonebook:
        print('\033[1m{0:20s}{1}\033[0m\n'.format('Name', 'Number'))
        for name, number in sorted(phonebook.items()):
            print('{0:20s}{1}'.format(name, number))
    else:
        print('\033[1mTHERE ARE NO ENTRIES.\033[0m\n')

    if data:
        data.close()

    footer('main', phonebook)

def add_new(phonebook):
    header()

    name, number = get_contact()

    phonebook.update({name : number})

    update_file(phonebook)

    footer('addnew')

def delete(phonebook):
    header()
    print('\033[1mENTER THE NAME OF THE CONTACT YOU WANT TO DELETE.\033[0m\n')

    contact = get_input(': ')
    found = isfound(phonebook, contact)

    if found:
        print('\033[1m\nDO YOU REALY WANT TO DELETE:\033[0m {0}({1})'\
            .format(contact, phonebook[contact]))
        print('\033[1m(YES FOR CONFIRM ANYTHING ELSE FOR CANCEL )\033[0m')

        confirm = get_input(': ')
        print(confirm)
        if confirm == 'YES':
            del phonebook[contact]

            update_file(phonebook)

            footer('delete')

        else:
            time.sleep(1)
            main_view()

    else:
        print('\nNOT FOUND')
        time.sleep(1)
        delete(phonebook)

def modify(phonebook):
    header()
    print('\033[1mENTER THE NAME OF THE CONTACT YOU WANT TO MODIFY.\033[0m\n')

    contact = get_input(': ')
    found = isfound(phonebook, contact)

    if found:

        name, number = get_contact()

        del phonebook[contact]
        phonebook.update({name : number})

        update_file(phonebook)

        footer('modify')
    else:
        print('\nNOT FOUND')
        time.sleep(1)
        modify(phonebook)

def footer(view, phonebook=None):
    if view == 'main':
        text = '\033[1mADD NEW(a)   MODIFY(m)   DELETE(d)   SEARCH(s)\
    EXIT(CTRL-D)\033[0m'.center(window_width)
        print('\n',text)

        try:
            action = input(': ')
        except (EOFError, KeyboardInterrupt):
            time.sleep(1)
            os.system('clear')
            exit(0)

        if action == 'a':
            add_new(phonebook)
        elif action == 'm':
            modify(phonebook)
        elif action == 'd':
            delete(phonebook)
        else:
            print('\nINVALID!')
            time.sleep(1)
            main_view()

    elif view == 'addnew' or view == 'modify' or view == 'delete':
        print('\033[1m\nSUCCESSFUL!\033[0m')
        time.sleep(1)
        main_view()

def get_contact():
    try:
        while True:
            name = input('\033[1m\nNAME: \033[0m')
            if name.isalpha():
                if len(name) > 16:
                    print('\033[91m\033[1mTOO LONG!(MAX:15)\033[0m\033[0m')
                    continue
                break
            else:
                print('\033[91m\033[1mALPHABETICAL CHARACTORS ONLY!\033[0m\
                    \033[0m')
        while True:
            number = input('\033[1m\nNUMBER: \033[0m')
            if number.isnumeric():
                if len(number) > 16:
                    print('\033[91m\033[1mTOO LONG!(MAX:15)\033[0m\033[0m')
                    continue
                break
            else:
                print('\033[91m\033[1mNUMBERS ONLY!\033[0m\033[0m')
    except EOFError:
        print('\033[1m\n\nYOU CANCELED THE OPERATION!\033[0m')
        time.sleep(1)
        main_view()
    except KeyboardInterrupt:
        time.sleep(1)
        os.system('clear')
        exit(0)

    return name, number

def get_input(string):
    try:
        var = input(string)
    except EOFError:
        print('\033[1m\n\nYOU CANCELED THE OPERATION!\033[0m')
        time.sleep(1)
        main_view()
    except KeyboardInterrupt:
        time.sleep(1)
        os.system('clear')
        exit(0)

    return var

def isfound(phonebook, contact):
    for name, number in phonebook.items():
        if contact == name:
            return True
    return False

def update_file(phonebook):
    data = open('phonebook.data', 'wb')
    pickle.dump(phonebook, data)
    data.close()

if __name__ == '__main__':
    main_view()

Answer 1

这适用于控制台。

>>> for n in range(10):
...     print('foo' + str(n), end = '\r')
...     time.sleep(.2)
...
>>>

如何在Python中

1 个答案: