Detecting pipe on stdout?

[Alexander Schreiber]

Hi!

Is there any way for a Python program to detect wether its stdout has
been redirected to a pipe/file (like "./programm | less")? I've didn't
find anything about this in the FAQ and failed to come up with the right
search terms for google.

Reason: I've got a Python program[0] here which normally colorizes its
output (to the terminal) using escape sequences. This is fine and nice
while running on a terminal, but when running the program with less
attached to it the escape sequences are annoying. Ideally, I want to
detect a pipe attached to stdout and switch of the color (the flag is
already there) in this case.

Regards,
      Alex.
[0] Not written by me.
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