On 10/18/2014 02:36 PM, George R Goffe wrote:
> Hi,
>
> When you run a python program, it appears that stdin, stdout, and stderr are
> opened automatically.
>
> I've been trying to find out how you tell if there's data in stdin (like when
> you pipe data to a python program) rather
> than in a named input file. It seems like most/all the Unix/Linux
> commands are able to figure this out. Do you know how Python programs do this
> or might do this?
>
> MANY thanks for any/all help/hints/tips/suggestions,
>
> George...
Command line argument parsing aside, perhaps something like this would
be useful:
script.py
-------------------------------------------
#!/usr/bin/env python3
import os, stat
mode = os.fstat(0).st_mode
if stat.S_ISFIFO(mode):
print("stdin is a pipe")
elif stat.S_ISREG(mode):
print("stdin is a redirected file")
elif stat.S_ISCHR(mode):
print("stdin is terminal")
else:
print("stdin is weird")
-------------------------------------------
$ ./script.py
stdin is terminal
$ cat script.py | ./script.py
stdin is a pipe
$ ./script.py < script.py
stdin is a redirected file
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