Raise minimum python version to 3.7

This version of python will be supported until 2023, while 3.6 will end
support at the end of this calendar year. Establishing 3.7 as our
baseline also simplifies our dependency requirements, which is a nice
bonus.

To reflect this change on the minimum support python version I've
removed the old versions from our matrix builds.

Signed-off-by: Rodrigo Tobar <rtobar@icrar.org>

.travis.yml

@@ -37,8 +37,6 @@ matrix:
     # - python: "3.8"
     #   env: TEST_OPENAPI=1
     - python: "3.7"
-    - python: "3.6"
-    - python: "3.5"
     - name: doxygen
       if: branch = master
       before_install:

daliuge-engine/setup.py

@@ -129,25 +129,15 @@ def run(self):
     "python-daemon",
     "pyzmq",
     "scp",
+    # 0.19.0 requires netifaces < 0.10.5, exactly the opposite of what *we* need
+    "zeroconf >= 0.19.1",
     # 0.6 brings python3 support plus other fixes
     "zerorpc >= 0.6",
     "pyarrow",
     "numpy"
 ]
 # Keep alpha-sorted PLEASE!
 
-# Python 2 support has been dropped in zeroconf 0.20.
-# Also, 0.19.0 requires netifaces < 0.10.5, exactly the opposite of what *we* need
-# Also, 0.21.0 erroneously tags 3.4 as supported, while in fact it isn't
-# (see https://github.com/jstasiak/python-zeroconf/issues/139 for details).
-# We provided a fix for that, so from 0.21.1 is already good.
-if sys.version_info[:2] == (2, 7):
-    install_requires.append("zeroconf == 0.19.1")
-elif sys.version_info[:2] <= (3, 4):
-    install_requires.append("zeroconf != 0.21.0")
-else:
-    install_requires.append("zeroconf >= 0.19.1")
-
 # Extra requirements that are not needed by your every day daliuge installation
 extra_requires = {
     # spead is required only for a specific app and its test, which we

daliuge-translator/setup.py

@@ -98,10 +98,8 @@ def package_files(directory):
     "cwlgen",
     "daliuge-common==%s" % (VERSION,),
     "metis>=0.2a3",
-    # Python 3.6 is only supported in NetworkX 2 and above
-    # But we are not compatible with 2.4 yet, so we need to constrain that
-    "networkx<2.4; python_version<'3.6'",
-    "networkx<2.4,>= 2.0; python_version>='3.6.0'",
+    # We are not compatible with networkx 2.4 yet, so we need to constrain that
+    "networkx<2.4",
     "numpy",
     "psutil",
     "pyswarm",

docs/installing.rst

@@ -68,7 +68,7 @@ installed on the system:
 Installing
 ##########
 
-|daliuge| requires python 3.
+|daliuge| requires python 3.7 or later.
 
 |daliuge| is based on setuptools, and thus it follows the standard python installation
 procedures.