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import os
import select
 
def main():
	master, slave = os.openpty()
	slave_name = os.ttyname(slave)
	print(f"{master=} {slave=} {slave_name=}")
 
	while True:
		ret = select.select([master], [], [])
		print(f"select returned, {ret=}")
		r = os.read(master, 1)
		print("read: ", r)
 
if __name__ == "__main__":
	main()
 

Traceback (most recent call last):
  File "/usr/lib/python3.7/py_compile.py", line 143, in compile
    _optimize=optimize)
  File "<frozen importlib._bootstrap_external>", line 791, in source_to_code
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<fstring>", line 1
    (master=)
           ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.7/py_compile.py", line 147, in compile
    raise py_exc
py_compile.PyCompileError:   File "<fstring>", line 1
    (master=)
           ^
SyntaxError: invalid syntax

Standard output is empty