Add support for Python 3

The Python bindings now support Python 3.  They have been tested only
with Python 2.7 and Python 3.7, but should work with any version of
Python 3 later than Python 3.1.

Test both versions in Travis-CI and fix some problems with the
Python coding style checks.

1 files changed, 3 insertions, 3 deletions

diff --git a/docs/metadata/requirements b/docs/metadata/requirements
index 47e5d42..b81f184 100644
--- a/docs/metadata/requirements
+++ b/docs/metadata/requirements
@@ -36,9 +36,9 @@ or later and phpize, plus any other programs that phpize requires.  PHP
 only tested on PHP 7.x and later.
 
 To build the Python bindings for the C client library, you will need
-Python 2.7 and the setuptools, pytest, pytest-runner, and typing modules.
-Earlier versions may work back to possibly Python 2.3 may work, but are
-not tested.  Python 3 is not (yet) supported.
+Python 2.7, or Python 3.1 or later.  You will also need the setuptools,
+pytest, and pytest-runner modules and, for Python 2, the typing module.
+Earlier versions may work back to possibly Python 2.3, but are not tested.
 
 To build the Ruby bindings for the C client library, you will need Ruby
 1.8 or later (primarily tested with 2.5 and later).