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Description of problem:
Popped up while highlighting kernel sources:
https://bitbucket.org/birkenfeld/pygments-main/issue/618/typeerror-when-guessing-the-lexer-of-a

Version-Release number of selected component (if applicable):
python-pygments-1.1.1-1.el6.noarch

How reproducible:
Try to guess lexer for a file starting with a dot

Additional info:
Patch available in upstream

This request was evaluated by Red Hat Product Management for
inclusion in the current release of Red Hat Enterprise Linux.
Because the affected component is not scheduled to be updated
in the current release, Red Hat is unfortunately unable to
address this request at this time. Red Hat invites you to
ask your support representative to propose this request, if
appropriate and relevant, in the next release of Red Hat
Enterprise Linux. If you would like it considered as an
exception in the current release, please ask your support
representative.

Upstream patch is:
  https://bitbucket.org/birkenfeld/pygments-main/changeset/92355db12206

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2017-0650.html