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

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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

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