Require Python 3.6

.travis.yml

@@ -6,8 +6,7 @@ before_install:
   - sudo apt-get -qq update
   - sudo apt-get install -yq libleveldb-dev librocksdb libsnappy-dev zlib1g-dev libbz2-dev libgflags-dev
 python:
-  - "3.5"
-  - "3.6-dev"
+  - "3.6"
   - "nightly"
 # command to install dependencies
 install:

README.rst

@@ -10,7 +10,7 @@ ElectrumX - Reimplementation of electrum-server
 For a future network with bigger blocks.
 
   :Licence: MIT
-  :Language: Python (>= 3.5.3)
+  :Language: Python (>= 3.6)
   :Author: Neil Booth
 
 Getting Started
@@ -53,35 +53,6 @@ Features
 - Peer discovery protocol removes need for IRC
 - Coin abstraction makes compatible altcoin and testnet support easy.
 
-Motivation
-==========
-
-Mainly for privacy reasons, I have long wanted to run my own Electrum
-server, but I struggled to set it up or get it to work on my
-DragonFlyBSD system and lost interest for over a year.
-
-In September 2016 I heard that electrum-server databases were getting
-large (35-45GB when gzipped), and it would take several weeks to sync
-from Genesis (and was sufficiently painful that no one seems to have
-done it for about a year).  This made me curious about improvements
-and after taking a look at the code I decided to try a different
-approach.
-
-I prefer Python3 over Python2, and the fact that Electrum is stuck on
-Python2 has been frustrating for a while.  It's easier to change the
-server to Python3 than the client, so I decided to write my effort in
-Python3.
-
-It also seemed like a good opportunity to learn about asyncio, a
-wonderful and powerful feature introduced in Python 3.4.
-Incidentally, asyncio would also make a much better way to implement
-the Electrum client.
-
-Finally though no fan of most altcoins I wanted to write a codebase
-that could easily be reused for those alts that are reasonably
-compatible with Bitcoin.  Such an abstraction is also useful for
-testnets.
-
 Implementation
 ==============
 
@@ -122,9 +93,7 @@ and associated complications.
 Roadmap
 =======
 
-- Require Python 3.6, which has several performance improvements
-  relevant to ElectrumX
-- offloading more work to synchronize to the client
+- offloading more work of wallet synchronization to the client
 - supporting better client privacy
 - wallet server engine
 - new features such as possibly adding label server functionality

compact_history.py

@@ -41,8 +41,8 @@ from server.db import DB
 
 
 def compact_history():
-    if sys.version_info < (3, 5, 3):
-        raise RuntimeError('Python >= 3.5.3 is required to run ElectrumX')
+    if sys.version_info < (3, 6):
+        raise RuntimeError('Python >= 3.6 is required to run ElectrumX')
 
     environ['DAEMON_URL'] = ''   # Avoid Env erroring out
     env = Env()

contrib/raspberrypi3/install_electrumx.sh

@@ -3,7 +3,7 @@
 # install electrumx
 ###################
 
-# upgrade raspbian to 'stretch' distribution for python 3.5 support
+# upgrade raspbian to 'stretch' distribution
 sudo echo 'deb http://mirrordirector.raspbian.org/raspbian/ testing main contrib non-free rpi' > /etc/apt/sources.list.d/stretch.list
 sudo apt-get update
 sudo apt-get dist-upgrade
@@ -23,4 +23,3 @@ sudo pip3 install irc
 git clone https://github.com/kyuupichan/electrumx.git
 cd electrumx
 sudo python3 setup.py install
-

docs/HOWTO.rst

@@ -10,7 +10,7 @@ small - pull requests are welcome.
 ================ ========================
 Package          Notes
 ================ ========================
-Python3          ElectrumX uses asyncio.  Python version >= 3.5.3 is
+Python3          ElectrumX uses asyncio.  Python version >= 3.6 is
                  **required**.
 `aiohttp`_       Python library for asynchronous HTTP.  Version >=
                  1.0 required; I am using 1.0.5.
@@ -203,9 +203,9 @@ set TimeoutStopSec to *at least* 10 mins in your `.service` file.
 Installing Python 3.6 under Ubuntu
 ----------------------------------
 
-Many Ubuntu distributions have an incompatible Python version baked in.
-Because of this, it is easier to install Python 3.6 rather than attempting
-to update Python 3.5.2 to 3.5.3.  See `contrib/python3.6/python-3.6.sh`_.
+Many Ubuntu distributions have an incompatible Python version baked
+in.  Because of this, it is easier to install Python 3.6.  See
+`contrib/python3.6/python-3.6.sh`_.
 
 
 Installing on Raspberry Pi 3

server/controller.py

@@ -36,7 +36,6 @@ class Controller(ServerBase):
     up with the daemon.
     '''
 
-    PYTHON_MIN_VERSION = (3, 5, 3)
     BANDS = 5
     CATCHING_UP, LISTENING, PAUSED, SHUTTING_DOWN = range(4)
 

setup.py

@@ -6,7 +6,7 @@ setuptools.setup(
     name='electrumx',
     version=VERSION.split()[-1],
     scripts=['electrumx_server.py', 'electrumx_rpc.py'],
-    python_requires='>=3.5.3',
+    python_requires='>=3.6',
     # "irc" package is only required if IRC connectivity is enabled
     # via environment variables, in which case I've tested with 15.0.4
     # "x11_hash" package (1.4) is required to sync DASH network.