Document PY_COLORS to enforce color output

[pytoxbot]

• Bitbucket: https://bitbucket.org/hpk42/tox/issue/163
• Originally reported by: @hashar
• Originally created at: 2014-03-21T18:30:40.458

While integrating a tox based job in Jenkins (which has a dumb terminal) I was looking for a way to force color output.
Looking at _py/terminalwriter.py , it looks up the environment variable PY_COLORS. A value of 1 would enforce color, a value of 0 would disable color. The global override the TERM value.

It would be nice to have PY_COLORS documented in the tox documentation.

py-trunk doc update request is: https://bitbucket.org/hpk42/py-trunk/issue/138/py_colors-env-is-undocumented

[pytoxbot]

Original comment by @hpk42

Could you submit a pull request for the doc addition?

[hashar]

Thank you @gaborbernat I had completely forgot/missed this issue :]