NameError: name 'msvcrt' is not defined

[Hongyi Zhao]

Hi,

I use python on Debian, when running some python codes, I meet the 
following error:

-----------
 input_username.py", line 18, in read_input
    if msvcrt.kbhit():
NameError: name 'msvcrt' is not defined
------------


How to solve this issue?