python non-block opening and reading from fifo (eagerly with select)

gistfile1.txt

In [93]: import os

In [94]: fd = os.open('fifo', os.O_RDONLY | os.O_NONBLOCK)

In [95]: f = os.fdopen(fd, 'rb')

In [96]: import select

In [97]:
    ...: while True:
    ...:     r,w,e = select.select([f], [], [f], 0.01)
    ...:     if r:
    ...:         print(f"== data available")
    ...:         print(f"== data: {f.read()}")
    ...:     else:
    ...:         stat = os.fstat(f.fileno())
    ...:         if stat.st_nlink == 0:
    ...:             print("== file is deleted!")
    ...:             break
    ...:
    ...:
== data available
== data: b'kkk\n'
== file is deleted!

In [98]:




on the other shell window:

mkfifo fifo
echo kkk >fifo
rm fifo