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[3.9] bpo-40635: Fix getfqdn() docstring and docs (GH-27971) #27978

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Aug 26, 2021
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[3.9] bpo-40635: Fix getfqdn() docstring and docs (GH-27971) #27978

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5 changes: 3 additions & 2 deletions Doc/library/socket.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -795,8 +795,9 @@ The :mod:`socket` module also offers various network-related services:
it is interpreted as the local host. To find the fully qualified name, the
hostname returned by :func:`gethostbyaddr` is checked, followed by aliases for the
host, if available. The first name which includes a period is selected. In
case no fully qualified domain name is available, the hostname as returned by
:func:`gethostname` is returned.
case no fully qualified domain name is available and *name* was provided,
it is returned unchanged. If *name* was empty or equal to ``'0.0.0.0'``,
the hostname from :func:`gethostname` is returned.


.. function:: gethostbyname(hostname)
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5 changes: 3 additions & 2 deletions Lib/socket.py
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Expand Up @@ -781,8 +781,9 @@ def getfqdn(name=''):
An empty argument is interpreted as meaning the local host.

First the hostname returned by gethostbyaddr() is checked, then
possibly existing aliases. In case no FQDN is available, hostname
from gethostname() is returned.
possibly existing aliases. In case no FQDN is available and `name`
was given, it is returned unchanged. If `name` was empty or '0.0.0.0',
hostname from gethostname() is returned.
"""
name = name.strip()
if not name or name == '0.0.0.0':
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