在python 3 (Windows)中，在不按Enter键的情况下使用带超时的输入提示来计算输入

import msvcrt

def input_with_timeout(prompt, timeout):
    print(prompt, end='', flush=True)
    start_time = time.time()
    input_data = ''
    while True:
        if msvcrt.kbhit():
            char = msvcrt.getche().decode('utf-8')
            if char == '\r':
                print()
                break
            elif char == '\x08':
                input_data = input_data[:-1]
            else:
                input_data += char
        current_time = time.time()
        if current_time - start_time > timeout:
            print()
            break
    return input_data

input_data = input_with_timeout('请输入一个数字：', 5)

try:
    number = float(input_data)
    result = number * 2
    print('计算结果：', result)
except ValueError:
    print('输入无效！')