Drop support for Python 3.4

closes #1353

.travis.yml

@@ -2,7 +2,6 @@ language: python
 cache: pip
 
 python:
-  - 3.4
   - 3.5
   - 3.6
   
@@ -14,12 +13,6 @@ env:
 matrix:
   fast_finish: true
   exclude:
-  - python: 3.4
-    env: TOXENV=flake8 
-  - python: 3.4
-    env: TOXENV=docsroot
-  - python: 3.4
-    env: TOXENV=docsserver
   - python: 3.5
     env: TOXENV=flake8 
   - python: 3.5 
@@ -27,10 +20,6 @@ matrix:
   - python: 3.5 
     env: TOXENV=docsserver
   include:
-  - python: 3.4
-    addons: 
-      rethinkdb: '2.3.5'
-    env: BIGCHAINDB_DATABASE_BACKEND=rethinkdb
   - python: 3.5
     addons: 
       rethinkdb: '2.3.5'

CONTRIBUTING.md

@@ -41,7 +41,7 @@ Familiarize yourself with how we do coding and documentation in the BigchainDB p
 ### Step 2 - Install some Dependencies
 
 * [Install RethinkDB Server](https://rethinkdb.com/docs/install/)
-* Make sure you have Python 3.4+ (preferably in a virtualenv)
+* Make sure you have Python 3.5+ (preferably in a virtualenv)
 * [Install BigchaindB Server's OS-level dependencies](https://docs.bigchaindb.com/projects/server/en/latest/appendices/install-os-level-deps.html)
 * [Make sure you have the latest Python 3 version of pip and setuptools](https://docs.bigchaindb.com/projects/server/en/latest/appendices/install-latest-pip.html)
 

PYTHON_STYLE_GUIDE.md

@@ -6,7 +6,7 @@ This guide starts out with our general Python coding style guidelines and ends w
 
 Our starting point is [PEP8](https://www.python.org/dev/peps/pep-0008/), the standard "Style Guide for Python Code." Many Python IDEs will check your code against PEP8. (Note that PEP8 isn't frozen; it actually changes over time, but slowly.)
 
-BigchainDB uses Python 3.4+, so you can ignore all PEP8 guidelines specific to Python 2.
+BigchainDB uses Python 3.5+, so you can ignore all PEP8 guidelines specific to Python 2.
 
 ### Python Docstrings
 

docs/server/source/appendices/install-latest-pip.md

@@ -5,7 +5,7 @@ You can check the version of `pip` you're using (in your current virtualenv) by
 pip -V
 ```
 
-If it says that `pip` isn't installed, or it says `pip` is associated with a Python version less than 3.4, then you must install a `pip` version associated with Python 3.4+. In the following instructions, we call it `pip3` but you may be able to use `pip` if that refers to the same thing. See [the `pip` installation instructions](https://pip.pypa.io/en/stable/installing/).
+If it says that `pip` isn't installed, or it says `pip` is associated with a Python version less than 3.5, then you must install a `pip` version associated with Python 3.5+. In the following instructions, we call it `pip3` but you may be able to use `pip` if that refers to the same thing. See [the `pip` installation instructions](https://pip.pypa.io/en/stable/installing/).
 
 On Ubuntu 16.04, we found that this works:
 ```text
@@ -17,4 +17,4 @@ That should install a Python 3 version of `pip` named `pip3`. If that didn't wor
 You can upgrade `pip` (`pip3`) and `setuptools` to the latest versions using:
 ```text
 pip3 install --upgrade pip setuptools
-```
+```

docs/server/source/production-nodes/node-requirements.md

@@ -5,9 +5,9 @@
 
 ## OS Requirements
 
-BigchainDB Server requires Python 3.4+ and Python 3.4+ [will run on any modern OS](https://docs.python.org/3.4/using/index.html), but we recommend using an LTS version of [Ubuntu Server](https://www.ubuntu.com/server) or a similarly server-grade Linux distribution.
+BigchainDB Server requires Python 3.5+ and Python 3.5+ [will run on any modern OS](https://docs.python.org/3.5/using/index.html), but we recommend using an LTS version of [Ubuntu Server](https://www.ubuntu.com/server) or a similarly server-grade Linux distribution.
 
-_Don't use macOS_ (formerly OS X, formerly Mac OS X), because it's not a server-grade operating system. Also, BigchaindB Server uses the Python multiprocessing package and [some functionality in the multiprocessing package doesn't work on Mac OS X](https://docs.python.org/3.4/library/multiprocessing.html#multiprocessing.Queue.qsize).
+_Don't use macOS_ (formerly OS X, formerly Mac OS X), because it's not a server-grade operating system. Also, BigchaindB Server uses the Python multiprocessing package and [some functionality in the multiprocessing package doesn't work on Mac OS X](https://docs.python.org/3.5/library/multiprocessing.html#multiprocessing.Queue.qsize).
 
 
 ## General Considerations

docs/server/source/production-nodes/setup-run-node.md

@@ -50,16 +50,16 @@ Consult the MongoDB documentation for its recommendations regarding storage hard
 
 ### Install BigchainDB Server Dependencies
 
-Before you can install BigchainDB Server, you must [install its OS-level dependencies](../appendices/install-os-level-deps.html) and you may have to [install Python 3.4+](https://www.python.org/downloads/).
+Before you can install BigchainDB Server, you must [install its OS-level dependencies](../appendices/install-os-level-deps.html) and you may have to [install Python 3.5+](https://www.python.org/downloads/).
 
 ### How to Install BigchainDB Server with pip
 
-BigchainDB is distributed as a Python package on PyPI so you can install it using `pip`. First, make sure you have an up-to-date Python 3.4+ version of `pip` installed:
+BigchainDB is distributed as a Python package on PyPI so you can install it using `pip`. First, make sure you have an up-to-date Python 3.5+ version of `pip` installed:
 ```text
 pip -V
 ```
 
-If it says that `pip` isn't installed, or it says `pip` is associated with a Python version less than 3.4, then you must install a `pip` version associated with Python 3.4+. In the following instructions, we call it `pip3` but you may be able to use `pip` if that refers to the same thing. See [the `pip` installation instructions](https://pip.pypa.io/en/stable/installing/).
+If it says that `pip` isn't installed, or it says `pip` is associated with a Python version less than 3.5, then you must install a `pip` version associated with Python 3.5+. In the following instructions, we call it `pip3` but you may be able to use `pip` if that refers to the same thing. See [the `pip` installation instructions](https://pip.pypa.io/en/stable/installing/).
 
 On Ubuntu 16.04, we found that this works:
 ```text

docs/server/source/quickstart.md

@@ -4,7 +4,7 @@ This page has instructions to set up a single stand-alone BigchainDB node for le
 
 A. Install MongoDB as the database backend. (There are other options but you can ignore them for now.)
 
-[Install MongoDB Server 3.4+](https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/)
+[Install MongoDB Server 3.5+](https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/)
 
 B. Run MongoDB. Open a Terminal and run the command:
 ```text

setup.py

@@ -112,7 +112,6 @@ setup(
         'Natural Language :: English',
         'License :: OSI Approved :: GNU Affero General Public License v3',
         'Programming Language :: Python :: 3 :: Only',
-        'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Operating System :: MacOS :: MacOS X',
         'Operating System :: POSIX :: Linux',

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 skipsdist = true
-envlist = py{34,35,36}-{rethinkdb,mongodb}, flake8, docsroot, docsserver
+envlist = py{35,36}-{rethinkdb,mongodb}, flake8, docsroot, docsserver
 
 [base]
 basepython = python3.6