On Sunday, October 16, 2016 at 1:15:56 PM UTC-5, Edward K. Ream wrote:

When this code is run outside a git repo, git log will issue a "fatal" 
> [sic] error. This will typically be true when the user is running an 
> "official" release. We can suppress such irrelevant messages by adding this 
> arg to the call to subprocess.Popen:
>
>     stderr=None if trace else subprocess.DEVNULL,
>

Arrgh.  pylint informs me that DEVNULL does not exist with Python2. Using 
subprocess.PIPE works with both 2 and 3.

EKR

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