update to README and Makefile to support both Python 2 and 3

Makefile

@@ -1,7 +1,10 @@
 
-venv:
+venv-py2:
 	virtualenv venv.garminexport
 
+venv-py3:
+	python3 -m venv venv.garminexport
+
 init:
 	pip install -r requirements.txt
 

README.md

@@ -1,28 +1,30 @@
 Garmin Connect activity backup tool
 ===================================
-``garminbackup.py`` is a program that downloads activities for a 
+``garminbackup.py`` is a program that downloads activities for a
-given [Garmin Connect](http://connect.garmin.com/) account and stores 
+given [Garmin Connect](http://connect.garmin.com/) account and stores
-them in a backup directory locally on the user's computer. The first time 
+them in a backup directory locally on the user's computer. The first time
 the program is run, it will download *all* activities. After that, it will
 do incremental backups of your account. That is, the script will only download
 activities that haven't already been downloaded to the backup directory.
 
-The library contains a simple utility program, ``get_activity.py`` for 
+The library contains a simple utility program, ``get_activity.py`` for
 downloading a single Garmin Connect activity. Run ``./get_activity.py --help``
 for more details.
 
 The library also contains a ``garminclient`` module that could be used by third-party
-projects that need to communicate over the Garmin Connect API. See the 
+projects that need to communicate over the Garmin Connect API. See the
 Library Import section below for more details.
 
 
 Prerequisites
 =============
 The instructions below for running the program (or importing the module)
-assumes that you have [Python 2.7](https://www.python.org/download/releases/2.7/),
+assumes that you have Python 2.7 or Python 3+,
-[pip](http://pip.readthedocs.org/en/latest/installing.html), and [virtualenv](http://virtualenv.readthedocs.org/en/latest/virtualenv.html#installation) installed.
+[pip](http://pip.readthedocs.org/en/latest/installing.html), and
+[virtualenv](http://virtualenv.readthedocs.org/en/latest/virtualenv.html#installation)
+(not required with Python 3) installed.
 
-It also assumes that you have registered an account at 
+It also assumes that you have registered an account at
 [Garmin Connect](http://connect.garmin.com/).
 
 
@@ -31,7 +33,14 @@ Getting started
 Create and activate a new virtual environment to create an isolated development
 environment (that contains the required dependencies and nothing else).
 
+    # using Python 2
     virtualenv venv.garminexport
+
+	# using Python 3
+	python -m venv venv.garminexport
+
+Activate the virtual environment
+
     . venv.garminexport/bin/activate
 
 Install the required dependencies in this virtual environment:
@@ -42,14 +51,14 @@ Install the required dependencies in this virtual environment:
 
 Running
 =======
-The backup program is run as follows (use the ``--help`` flag for a full list 
+The backup program is run as follows (use the ``--help`` flag for a full list
 of available options):
 
     ./garminbackup.py --backup-dir=activities <username or email>
 
 Once started, the program will prompt you for your account password and then
 log in to your Garmin Connect account to download activities to the specified
-backup directory on your machine. The program will only download activities 
+backup directory on your machine. The program will only download activities
 that aren't already in the backup directory.
 
 Activities can be exported in any of the formats outlined below. Note that
@@ -59,7 +68,7 @@ by default, the program downloads all formats for every activity. Use the
 Supported export formats:
 
   -   ``json_summary``: activity summary file (JSON)
-    
+
   -   ``json_details``: activity details file (JSON)
 
   -   ``gpx``: activity GPX file (XML)
@@ -80,7 +89,7 @@ Each activity file is prefixed by its upload timestamp and its activity id.
 
 Library import
 ==============
-To install the development version of this library in your local Python 
+To install the development version of this library in your local Python
 environment, run:
 
   `pip install -e git://github.com/petergardfjall/garminexport.git#egg=garminexport`

setup.py

@@ -22,4 +22,5 @@ setup(name="Garmin Connect activity exporter",
           'Natural Language :: English',
           'License :: OSI Approved :: Apache Software License',
           'Programming Language :: Python :: 2.7',
+          'Programming Language :: Python :: 3.5+',
       ])