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logging: try to avoid using ANSI color codes when not logging to a terminal
Color on the console is nice, but it is annoying to get these codes when for
example redirecting to a file.
The formatter doesn't know exactly where the message will be used - it is fully
configurable. In the default configuration, the messages are passed to a
StreamHandler to sys.stderr .
As an approximate optmization, hardcode the color formatters to only emit color
formatting if logging to something that isatty.
Color on the console is nice, but it is annoying to get these codes when for
example redirecting to a file.
The formatter doesn't know exactly where the message will be used - it is fully
configurable. In the default configuration, the messages are passed to a
StreamHandler to sys.stderr .
As an approximate optmization, hardcode the color formatters to only emit color
formatting if logging to something that isatty.