Drop Python 2.7 and 3.4 support

* Update setup.py requires and classifiers
* Drop Python 2.7 and 3.4 from CI
* Update docs dropping 2.7 and 3.4 support
* Fix mock imports and remove tests related to pypi's mock module
* Add py27 and 34 support docs to the sidebar
* Remove usage of six from tmpdir
* Remove six.PY* code blocks
* Remove sys.version_info related code
* Cleanup compat
* Remove obsolete safe_str
* Remove obsolete __unicode__ methods
* Remove compat.PY35 and compat.PY36: not really needed anymore
* Remove unused UNICODE_TYPES
* Remove Jython specific code
* Remove some Python 2 references from docs

Related to #5275

1 files changed, 3 insertions, 16 deletions

diff --git a/src/_pytest/pathlib.py b/src/_pytest/pathlib.py
index 729c41797..2cd931b32 100644
--- a/src/_pytest/pathlib.py
+++ b/src/_pytest/pathlib.py
@@ -8,7 +8,6 @@ import os
 import shutil
 import sys
 import uuid
-from functools import reduce
 from os.path import expanduser
 from os.path import expandvars
 from os.path import isabs
@@ -18,9 +17,8 @@ from posixpath import sep as posix_sep
 import six
 from six.moves import map
 
-from .compat import PY36
 
-if PY36:
+if sys.version_info[:2] >= (3, 6):
     from pathlib import Path, PurePath
 else:
     from pathlib2 import Path, PurePath
@@ -84,17 +82,6 @@ def parse_num(maybe_num):
         return -1
 
 
-if six.PY2:
-
-    def _max(iterable, default):
-        """needed due to python2.7 lacking the default argument for max"""
-        return reduce(max, iterable, default)
-
-
-else:
-    _max = max
-
-
 def _force_symlink(root, target, link_to):
     """helper to create the current symlink
 
@@ -119,7 +106,7 @@ def make_numbered_dir(root, prefix):
     """create a directory with an increased number as suffix for the given prefix"""
     for i in range(10):
         # try up to 10 times to create the folder
-        max_existing = _max(map(parse_num, find_suffixes(root, prefix)), default=-1)
+        max_existing = max(map(parse_num, find_suffixes(root, prefix)), default=-1)
         new_number = max_existing + 1
         new_path = root.joinpath("{}{}".format(prefix, new_number))
         try:
@@ -230,7 +217,7 @@ def try_cleanup(path, consider_lock_dead_if_created_before):
 
 def cleanup_candidates(root, prefix, keep):
     """lists candidates for numbered directories to be removed - follows py.path"""
-    max_existing = _max(map(parse_num, find_suffixes(root, prefix)), default=-1)
+    max_existing = max(map(parse_num, find_suffixes(root, prefix)), default=-1)
     max_delete = max_existing - keep
     paths = find_prefixed(root, prefix)
     paths, paths2 = itertools.tee(paths)