Revert "drop support for python 3.5, fixes #3919"

This reverts commit 55314f807e.

.travis.yml

@@ -8,10 +8,10 @@ cache:
 
 matrix:
     include:
-        - python: 3.6
+        - python: 3.5
           os: linux
           dist: trusty
-          env: TOXENV=flake8
+          env: TOXENV=py35
         - python: 3.6
           os: linux
           dist: trusty
@@ -28,6 +28,14 @@ matrix:
           os: linux
           dist: xenial
           env: TOXENV=py37
+        - python: 3.5
+          os: linux
+          dist: xenial
+          env: TOXENV=flake8
+        - language: generic
+          os: osx
+          osx_image: xcode8.3
+          env: TOXENV=py35
         - language: generic
           os: osx
           osx_image: xcode8.3

.travis/install.sh

@@ -19,6 +19,10 @@ if [[ "$(uname -s)" == 'Darwin' ]]; then
     brew install Caskroom/cask/osxfuse
 
     case "${TOXENV}" in
+        py35)
+            pyenv install 3.5.2
+            pyenv global 3.5.2
+            ;;
         py36)
             pyenv install 3.6.0
             pyenv global 3.6.0

Vagrantfile

@@ -140,7 +140,7 @@ def install_borg(fuse)
     . ~/.bash_profile
     cd /vagrant/borg
     . borg-env/bin/activate
-    pip install -U wheel  # upgrade wheel, too old for 3.6
+    pip install -U wheel  # upgrade wheel, too old for 3.5
     cd borg
     pip install -r requirements.d/development.txt
     python setup.py clean
@@ -310,6 +310,6 @@ Vagrant.configure(2) do |config|
     b.vm.provision "run tests", :type => :shell, :privileged => false, :inline => run_tests("darwin64")
   end
 
-  # TODO: create more VMs with python 3.6 and openssl 1.1.
+  # TODO: create more VMs with python 3.5+ and openssl 1.1.
   # See branch 1.1-maint for a better equipped Vagrantfile (but still on py34 and openssl 1.0).
 end

setup.py

@@ -276,6 +276,7 @@ setup(
         'Operating System :: POSIX :: Linux',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Topic :: Security :: Cryptography',
@@ -302,5 +303,5 @@ setup(
     setup_requires=['setuptools_scm>=1.7'],
     install_requires=install_requires,
     extras_require=extras_require,
-    python_requires='>=3.6',
+    python_requires='>=3.5',
 )

src/borg/archiver.py

@@ -2138,11 +2138,11 @@ class Archiver:
 
         {now}
             The current local date and time, by default in ISO-8601 format.
-            You can also supply your own `format string <https://docs.python.org/3.6/library/datetime.html#strftime-and-strptime-behavior>`_, e.g. {now:%Y-%m-%d_%H:%M:%S}
+            You can also supply your own `format string <https://docs.python.org/3.5/library/datetime.html#strftime-and-strptime-behavior>`_, e.g. {now:%Y-%m-%d_%H:%M:%S}
 
         {utcnow}
             The current UTC date and time, by default in ISO-8601 format.
-            You can also supply your own `format string <https://docs.python.org/3.6/library/datetime.html#strftime-and-strptime-behavior>`_, e.g. {utcnow:%Y-%m-%d_%H:%M:%S}
+            You can also supply your own `format string <https://docs.python.org/3.5/library/datetime.html#strftime-and-strptime-behavior>`_, e.g. {utcnow:%Y-%m-%d_%H:%M:%S}
 
         {user}
             The user name (or UID, if no name is available) of the user running borg.

tox.ini

@@ -2,7 +2,7 @@
 # fakeroot -u tox --recreate
 
 [tox]
-envlist = py{36,37},flake8
+envlist = py{35,36,37},flake8
 
 [testenv]
 deps =