Description of problem:

Python 3.4's entire ssl module was backported to 2.7.9 [1].  Tornado already has a conditional statement to import CertificateError and match_hostname from the standard library ssl module if they are available [2].  Effectively, the rpm has a dependency that isn't being used.  Because of that, I believe that these lines should be removed from the python-tornado spec file [3].

-BuildRequires:  python-backports-ssl_match_hostname
-Requires:       python-backports-ssl_match_hostname

Version-Release number of selected component (if applicable):

python-tornado-3.2.2-1.fc22

How reproducible:

$ # CertificateError in the standard library
$ grep 'class CertificateError' /usr/lib64/python2.7/ssl.py
class CertificateError(ValueError):

$ # match_hostname in the standard library
$ grep 'def match_hostname' /usr/lib64/python2.7/ssl.py
def match_hostname(cert, hostname):

$ # tornado tries to import from the standard library first
$ grep -B4 backports /usr/lib64/python2.7/site-packages/tornado/netutil.py
if hasattr(ssl, 'match_hostname') and hasattr(ssl, 'CertificateError'):  # python 3.2+
    ssl_match_hostname = ssl.match_hostname
    SSLCertificateError = ssl.CertificateError
else:
    import backports.ssl_match_hostname
    ssl_match_hostname = backports.ssl_match_hostname.match_hostname
    SSLCertificateError = backports.ssl_match_hostname.CertificateError

Actual results:

The RPM has a dependency that it isn't using.

Expected results:

The RPM only depends on things it actually needs.

Additional info:

[1] https://www.python.org/downloads/release/python-279/
[2] https://github.com/tornadoweb/tornado/blob/v3.2.2/tornado/netutil.py#L32-L38
[3] http://pkgs.fedoraproject.org/cgit/python-tornado.git/tree/python-tornado.spec#n20