Drop support for Python 3.5 (#750)

* Drop support for Python 3.5

This commit drops support for running with python 3.5. It marks the
minimum supported version of the package as python 3.6, removes python
3.5 package pins, removes the 3.5 CI jobs, and removes the warning on
python 3.5. Looking at the PyPI stats since the deprecation period
started the number of users on Python 3.5 has diminished significantly,
but not disappeared. There were 90 downloads with pip from pypi out of
total of 16,615 total pip downloads in the last 30 days. Compared to the
roughly 10% figure when we deprecated Python 3.5.

Merging this means we can not release until after the documented EoL
date for Python 3.5 support of September 13. This shouldn't be a problem
because with Qiskit/qiskit#4767 we will need to coordinate the
release of all the qiskit elements and are planning to do that after
09/13/2020.

It's worth noting that we should start planning to deprecate python 3.6
support sooner rather than later it goes EoL upstream at the end of
next year [1] and some of our other upstream dependencies (mainly numpy
et al) are going to remove support before the upstream Python EoL date
[2].

[1] https://devguide.python.org/#branchstatus
[2] https://numpy.org/neps/nep-0029-deprecation_policy.html

* Add release notes

* Update version in release note

Co-authored-by: Jessie Yu <jessieyu@us.ibm.com>

.travis.yml

@@ -45,7 +45,7 @@ stage_linux: &stage_linux
   <<: *stage_generic
   os: linux
   language: python
-  python: 3.5
+  python: 3.6
 
 stage_osx: &stage_osx
   <<: *stage_generic
@@ -82,9 +82,6 @@ stage_win: &stage_win
     |
     export PATH="/c/Python${PYTHON_VERSION}:/c/Python${PYTHON_VERSION}/Scripts:${PATH}"
     case $PYTHON_VERSION in
-      35)
-        choco install python --version 3.5.4
-        ;;
       36)
         choco install python --version 3.6.5
         ;;
@@ -115,7 +112,7 @@ jobs:
   include:
     # "lint and and pure python test" stage
     ###########################################################################
-    # Linter and style check (GNU/Linux, Python 3.5)
+    # Linter and style check (GNU/Linux, Python 3.7)
     - stage: lint and pure python test
       <<: *stage_linux
       if: type != cron
@@ -129,7 +126,7 @@ jobs:
       if: type != cron
       script: make mypy
 
-    # Run the tests against without compilation (GNU/Linux, Python 3.5)
+    # Run the tests against without compilation (GNU/Linux, Python 3.6)
     - stage: lint and pure python test
       <<: *stage_linux
       if: type != cron
@@ -156,14 +153,6 @@ jobs:
       dist: xenial
       python: 3.8
 
-    # OSX, Python 3.5.6 (via pyenv)
-    - stage: test
-      <<: *stage_osx
-      if: type != cron
-      env:
-        - MPLBACKEND=ps
-        - PYTHON_VERSION=3.5.6
-
     # OSX, Python 3.6.5 (via pyenv)
     - stage: test
       <<: *stage_osx
@@ -228,11 +217,6 @@ jobs:
       <<: *stage_win
       env:
         - PYTHON_VERSION=36
-    # Windows, Python 3.5
-    - if: type = cron
-      <<: *stage_win
-      env:
-        - PYTHON_VERSION=35
     - if: tag IS present
       language: python
       python: "3.6"

azure-pipelines.yml

@@ -13,8 +13,6 @@ jobs:
 #  condition: eq(variables['Build.Reason'], 'PullRequest')
   strategy:
     matrix:
-      Python35:
-        python.version: '3.5'
       Python36:
         python.version: '3.6'
       Python37:
@@ -44,10 +42,8 @@ jobs:
   condition: eq(variables['Build.Reason'], 'Schedule')
   strategy:
     matrix:
-      Python35:
-        python.version: '3.5'
-#      Python36:
-#        python.version: '3.6'
+      Python36:
+        python.version: '3.6'
 #      Python37:
 #        python.version: '3.7'
   steps:

releasenotes/notes/drop-py35-0eec8b799e9ae407.yaml

@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    The deprecated support for running qiskit-ibmq-provider with Python 3.5 has
+    been removed. To use qiskit-ibmq-provider >=0.10.0 you will now need at
+    least Python 3.6. If you are using Python 3.5 the last version which will
+    work is qiskit-ibmq-provider 0.9.x.

requirements-dev.txt

@@ -3,8 +3,7 @@ pycodestyle
 pylint>=2.4
 pylintfileheader>=0.0.2
 vcrpy
-pproxy==1.2.2; python_version <= '3.5'
-pproxy==2.1.8; python_version > '3.5'
+pproxy==2.1.8
 Sphinx>=1.8.3,<3.1.0
 sphinx-rtd-theme>=0.4.0
 sphinx-tabs>=1.1.11 

setup.py

@@ -61,7 +61,6 @@
         "Operating System :: MacOS",
         "Operating System :: POSIX :: Linux",
         "Programming Language :: Python :: 3 :: Only",
-        "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
@@ -84,7 +83,7 @@
               'qiskit.providers.ibmq.random'],
     install_requires=REQUIREMENTS,
     include_package_data=True,
-    python_requires=">=3.5",
+    python_requires=">=3.6",
     zip_safe=False,
     extras_require={'visualization': ['matplotlib>=2.1', 'ipywidgets>=7.3.0',
                                       "seaborn>=0.9.0", "plotly>=4.4",

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 2.1
-envlist = py35, py36, py37, lint, docs
+envlist = py36, py37, lint, docs
 skipsdist = True
 
 [testenv]