Author Antony.Lee
Recipients Antony.Lee, Ethan Smith, Ivan.Pozdeev, barry, brett.cannon, christian.heimes, eric.smith, eric.snow, mhammond, ncoghlan, pitrou, takluyver, terry.reedy
Date 2018-10-25.20:47:07
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Message-id <1540500427.88.0.788709270274.issue33944@psf.upfronthosting.co.za>
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There are a number of packages that can "self-import" into any Python process depending on the presence of an environment variable, by installing a pth file that contains something like `import os; __import__("thepkg") if os.environ.get("THEENVVAR") else None`.  Examples include colorization of logging output (https://coloredlogs.readthedocs.io/en/latest/api.html#environment-variables) or installation of a trace function (https://pypi.org/project/hunter/#environment-variable-activation).

If the pth mechanism goes away, a preload system should definitely be present to provide a replacement; it should again support multiple packages each installing their own hook.
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Date User Action Args
2018-10-25 20:47:08Antony.Leesetrecipients: + Antony.Lee, mhammond, barry, brett.cannon, terry.reedy, ncoghlan, pitrou, eric.smith, christian.heimes, eric.snow, takluyver, Ivan.Pozdeev, Ethan Smith
2018-10-25 20:47:07Antony.Leesetmessageid: <1540500427.88.0.788709270274.issue33944@psf.upfronthosting.co.za>
2018-10-25 20:47:07Antony.Leelinkissue33944 messages
2018-10-25 20:47:07Antony.Leecreate