How to clear buffer data? sys.stdin.flush does not work

Question

I want to know how can I make the buffer clean, from whatever it contains. I searched a little about it and some people say use sys.stdin.flush but it does not work.

In [1]: import sys                                                                                                                                                              

In [2]: sys.stdin.read(1)                                                                                                                                                       
long long long string 1234567890
Out[2]: 'l'

In [3]: sys.stdin.read(1)                                                                                                                                                       
Out[3]: 'o'

In [4]: sys.stdin.flush()                                                                                                                                                       

In [5]: sys.stdin.read(1)                                                                                                                                                       
Out[5]: 'n'

[This thread](https://stackoverflow.com/questions/2520893/how-to-flush-the-input-stream-in-python) might help. — sj95126, Aug 14 '21 at 17:49
@sj95126 thanks, but the solution is for windows, I'm using linux — Amir reza Riahi, Aug 14 '21 at 17:51
@AmirrezaRiahi did you read all the answers? Some don't use `msvcrt` — MattDMo, Aug 14 '21 at 17:52

How to clear buffer data? sys.stdin.flush does not work

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