How do I detect whether sys.stdout is attached to terminal or not? [duplicate]

Question

This can be detected using isatty:

if sys.stdout.isatty():
    # You're running in a real terminal
else:
    # You're being piped or redirected

To demonstrate this in a shell:

• python -c "import sys; print(sys.stdout.isatty())" should write True
• python -c "import sys; print(sys.stdout.isatty())" | cat should write False