The pty module can be used for pseudo terminals, about which I actually know very little.
Here are some simple tests I have conducted in my own Ubuntu PC, and I write down it just as a reminding note.
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Open pseudo terminal pairs
At the beginning, check the content of /dev/pts:
$ ls /dev/pts
0 1 ptmx
Open another terminal for IPython and then test with pty module as the following:
In [1]: import pty
In [2]: pty.openpty()
Out[2]: (3, 4)
Now check /dev/pts again:
$ ls /dev/pts
0 1 2 ptmx
Go back to IPython:
In [3]: pty.openpty()
Out[3]: (5, 6)
The content of /dev/pts becomes:
$ ls /dev/pts
0 1 2 3 ptmx
Exit IPython, then check the /dev/pts:
$ ls /dev/pts
0 1 ptmx
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Read and Write test
To read from the pseudo terminal, it seems necessary to write something first.
In [1]: import pty
In [2]: pty.openpty()
Out[2]: (3, 4)
In [3]: pty._writen(3,"test")
In [4]: pty._read(3)
Out[4]: 'test'
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Ref:
how to use /dev/ptmx for create a virtual serial port?
Python: module pty
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