Travis output not a TTY on Windows builders

Environments Windows
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2

Checking this locally in Git Bash gives the same result:

MINGW64 ~
$ python -c 'import sys,os; print os.isatty(sys.stdout.fileno())'
False

So this is Git Bash’s (or rather, the underlying MinGW64’s) problem.

https://stackoverflow.com/questions/40912072/git-for-windows-mintty-sys-stdout-isatty-returns-false suggests that this can be worked around by running the command via winpty:

MINGW64 ~
$ winpty python -c 'import sys,os; print os.isatty(sys.stdout.fileno())'
True
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