Martin Panter added the comment:
Looking at this more closely, the check seems to be there just to check if
basic DNS lookups are working. It was added for Issue 12804. One option might
be to replace it with a support.transient_internet() handler:
# Check for internet access before running test (issue #12804).
with support.transient_internet('python.org'):
socket.gethostbyname('python.org')
# these should all be successful
...
According to the socket module source code, gethostbyname() calls the OS-level
getaddrinfo() rather gethostbyname(), hence the “gaierror” handling. The error
codes that get raised seem to be a platform-dependent mess, but
transient_internet() looks like it catches EAI_NONAME, _FAIL, _NODATA and
WSANO_DATA (among others). EAI_NODATA seems to have been removed from RFC 3493
and current Posix, but was apparently originally meant to be for looking up
records that did exist but (say) did not have any IP v4 addresses.
----------
nosy: +nadeem.vawda
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