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Utility functions surrounding terminal devices & I/O.

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Determine current local pseudoterminal dimensions.

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.. versionadded:: 1.0
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Detect if given stdin ``stream`` seems to be in the foreground of a TTY.

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likely that the process has been placed in the background.

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stdin so it runs in a character-buffered mode; touching the terminal in
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.. versionadded:: 1.0
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Force local terminal ``stream`` be character, not line, buffered.

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Test ``input_`` to determine whether a read action will succeed.

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.. versionadded:: 1.0
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Query stream ``input_`` to see how many bytes may be readable.

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.. versionadded:: 1.0
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