Commits on Apr 16, 2018

1. Add pip.main as func raising clean error …

   This has upsides and downsides. It improves the errors and guidance for
   those who invoke `pip.main`, but it changes the time of failure for some
   modules attempting to import and use `pip.main`. Instead of failing at
   import time, they'll fail when they invoke `pip.main()`.
   On the plus side, it means that modules which import pip.main but only
   use it in some of their functions/classes may remain otherwise
   functional, so the scope of breakage is reduced.
   
   Modules using `pip.main()` are going to be broken one way or another,
   and although ImportErrors will be superior for a number of users, it
   forbids us from sending good and clear messaging about what to do to
   remediate.
   
   Advertising pip<10 as "maybe working" is probably a bit controversial,
   but it's practical/useful info. Whether or not pip takes a hardline
   stance on this is a matter for discussion/debate.

   

   sirosen committed Apr 16, 2018
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