#7970: Make `hg` interfaces use `subprocess.Popen` and return exit code
---------------------------+------------------------------------------------
   Reporter:  craigcitro   |       Owner:  GeorgSWeber
       Type:  enhancement  |      Status:  new        
   Priority:  major        |   Milestone:             
  Component:  build        |    Keywords:             
Work_issues:               |      Author:             
   Upstream:  N/A          |    Reviewer:             
     Merged:               |  
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 As mentioned on #7760, it would be nice if the `hg_sage`, etc. returned
 the exit code from the `__call__` method. We'd have to switch `os.popen3`
 to `subprocess.Popen` to do this, which isn't so bad, and is worth it in
 the long run (since `os.popen3` is deprecated).

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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7970>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
and MATLAB
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