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Groups > comp.lang.python > #197191

is input from a pipe?

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Not a question, but a quick note about a problem that sometimes pops up in 
forums, that is how to detect on Linux if standard input (or any I/O 
stream) is via pipe. My suggestion is to check if the stream is a FIFO, if 
True it is a pipe, otherwise not a pipe 

The solution that sometimes is proposed, that is

if not sys.stdin.isatty()

simply checks if the input is not from a terminal, but it may be from a 
file, not only from a pipe.


import os
import sys
import stat 
def check_if_stream_is_pipe(ifile):
    return stat.S_ISFIFO(os.fstat(ifile.fileno()).st_mode)

print(check_if_stream_is_pipe(sys.stdin))

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is input from a pipe? km <kammamuri@libero.it> - 2025-01-15 18:31 +0000

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