Return a 3-tuple (login, account, password)
of authenticators for host. If the netrc file did not
contain an entry for the given host, return the tuple associated with
the `default' entry. If neither matching host nor default entry is
available, return None.
Note:
Passwords are limited to a subset of the ASCII character set.
Versions of this module prior to 2.2.3 were extremely limited.
Starting with 2.2.3, all ASCII punctuation is allowed in
passwords. However, note that whitespace and non-printable
characters are not allowed in passwords. This is a limitation of
the way the .netrc file is parsed and may be removed in the
future.
