Officially remove py35 support (facebookresearch#1797)

* Mandate python36 in setup.py. Committing for circle testing.

* Remove environment.

Author: stephenroller

.circleci/config.yml

@@ -11,10 +11,6 @@ standard_cpu36: &standard_cpu36
   docker:
     - image: circleci/python:3.6.5-node
 
-standard_cpu35: &standard_cpu35
-  docker:
-    - image: circleci/python:3.5.7
-
 gpu: &gpu
   environment:
     CUDA_VERSION: "10.0"
@@ -61,12 +57,6 @@ installtorchgpu: &installtorchgpu
       pip3 install --progress-bar off pytorch-pretrained-bert
       pip3 install --progress-bar off torchtext
 
-installtorchcpu35: &installtorchcpu35
-  run:
-    name: Install torch CPU and dependencies
-    command: |
-      pip3 install --progress-bar off https://download.pytorch.org/whl/cpu/torch-1.0.1.post2-cp35-cp35m-linux_x86_64.whl
-
 installtorchcpu36: &installtorchcpu36
   run:
     name: Install torch CPU and dependencies
@@ -116,19 +106,6 @@ jobs:
           name: Data tests
           command: python setup.py test -s tests.suites.datatests -v
 
-  unittests_35:
-    <<: *standard_cpu35
-    working_directory: ~/ParlAI
-    steps:
-      - checkout
-      - <<: *fixgit
-      - <<: *setup
-      - <<: *installdeps
-      - <<: *installtorchcpu35
-      - run:
-          name: Unit tests (py35)
-          command: python setup.py test -s tests.suites.unittests -v
-
   unittests_36:
     <<: *standard_cpu36
     working_directory: ~/ParlAI
@@ -287,7 +264,6 @@ workflows:
       - lint
       - unittests_37
       - unittests_36
-      - unittests_35
       - mturk_tests:
           filters:
             branches:
@@ -316,7 +292,6 @@ workflows:
               only:
                 - master
     jobs:
-      - unittests_35
       - unittests_36
       - unittests_37
       - mturk_tests

README.md

@@ -112,7 +112,7 @@ python projects/convai2/interactive.py -mf models:convai2/kvmemnn/model
 
 ## Requirements
 
-ParlAI currently requires Python3.
+ParlAI currently requires Python3.6 or higher.
 
 Dependencies of the core modules are listed in requirement.txt.
 

setup.py

@@ -8,8 +8,8 @@
 from setuptools import setup, find_packages
 import sys
 
-if sys.version_info < (3,):
-    sys.exit('Sorry, Python 3 is required for ParlAI.')
+if sys.version_info < (3, 6):
+    sys.exit('Sorry, Python >=3.6 is required for ParlAI.')
 
 with open('README.md', encoding="utf8") as f:
     readme = f.read()
@@ -27,6 +27,7 @@
     long_description=readme,
     url='http://parl.ai/',
     license=license,
+    python_requires='>=3.6',
     packages=find_packages(exclude=(
         'data', 'docs', 'downloads', 'examples', 'logs', 'tests')),
     install_requires=reqs.strip().split('\n'),