Remove python 2.7 support

Version 2.7 of Python soon will reach the end of its live. It already
hinders the application of new language features which are incompatible
with 2.7. Thus, stopping to support `python2.7.` is necessary.

All major distributions ship some version of the Python3 series already.
Thus, stopping to support `python2.7` should be relatively light in
trouble for users.

* CleanUp Get rid of builtins variable
* CleanUp Get rid of try-expect for ImportError
* CleanUp Get rid of try-expect for NameError
* CleanUp Remove encoding declarations
* CleanUp Remove unicode prefix from string literals
* CleanUp Remove unicode prefix from string literals
* Require Python >= 3.5 in setup.py

Co-authored-by: Max Görner <max@familie-goerner.eu>

Reference PR: jazzband#305

.travis.yml

@@ -6,10 +6,6 @@ matrix:
           os: linux
           dist: xenial
           env: TOXENV=flake8
-        - python: 2.7
-          os: linux
-          dist: trusty
-          env: TOXENV=py27
         - python: 3.5
           os: linux
           dist: trusty

CHANGELOG.md

@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - The `log` command output can now be filtered to exclude projects and tags via `--ignore-project` and `--ignore-tag` (#395)
 
+### Removed
+
+- Python 2.7 support (#305).
+
 ## [1.10.0] - 2020-07-03
 
 ### Added

scripts/fuzzer.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
 
 import arrow
 import random

scripts/gen-cli-docs.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
 
 import inspect
 

setup.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
 """Setup file for the Watson distribution."""
 
 from os.path import join
@@ -46,6 +45,7 @@ def parse_requirements(requirements, ignore=('setuptools',)):
     license='MIT',
     long_description=readme,
     install_requires=parse_requirements('requirements.txt'),
+    python_requires='>=3.5',
     tests_require=parse_requirements('requirements-dev.txt'),
     entry_points={
         'console_scripts': [
@@ -64,8 +64,6 @@ def parse_requirements(requirements, ignore=('setuptools',)):
         "Operating System :: MacOS",
         "Operating System :: Microsoft :: Windows",
         "Operating System :: POSIX",
-        "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",

tests/__init__.py

@@ -2,16 +2,8 @@
 
 import os
 import datetime
-
-try:
-    from unittest import mock
-except ImportError:
-    import mock
-
-try:
-    from StringIO import StringIO
-except ImportError:
-    from io import StringIO
+import mock
+from io import StringIO
 
 import py
 

tests/test_config.py

@@ -8,7 +8,7 @@
 
 
 def test_config_get(mocker, watson):
-    content = u"""
+    content = """
 [backend]
 url = foo
 token =
@@ -24,7 +24,7 @@ def test_config_get(mocker, watson):
 
 
 def test_config_getboolean(mocker, watson):
-    content = u"""
+    content = """
 [options]
 flag1 = 1
 flag2 = ON
@@ -48,7 +48,7 @@ def test_config_getboolean(mocker, watson):
 
 
 def test_config_getint(mocker, watson):
-    content = u"""
+    content = """
 [options]
 value1 = 42
 value2 = spamm
@@ -72,7 +72,7 @@ def test_config_getint(mocker, watson):
 
 
 def test_config_getfloat(mocker, watson):
-    content = u"""
+    content = """
 [options]
 value1 = 3.14
 value2 = 42
@@ -99,7 +99,7 @@ def test_config_getfloat(mocker, watson):
 
 
 def test_config_getlist(mocker, watson):
-    content = u"""
+    content = """
 # empty lines in option values (including the first one) are discarded
 [options]
 value1 =

tests/test_utils.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """Unit tests for the 'utils' module."""
 
 import arrow
@@ -9,15 +8,8 @@
 import os
 import datetime
 import operator
-
-try:
-    from StringIO import StringIO
-except ImportError:
-    from io import StringIO
-try:
-    from unittest.mock import patch
-except ImportError:
-    from mock import patch
+from io import StringIO
+from mock import patch
 import pytest
 from click.exceptions import Abort
 from dateutil.tz import tzutc
@@ -35,7 +27,6 @@
     safe_save,
     sorted_groupby,
     parse_tags,
-    PY2,
     json_arrow_encoder,
 )
 from . import mock_datetime
@@ -104,11 +95,9 @@ def test_make_json_writer_with_kwargs():
 
 def test_make_json_writer_with_unicode():
     fp = StringIO()
-    writer = make_json_writer(lambda: {u'ùñï©ôð€': u'εvεrywhεrε'})
+    writer = make_json_writer(lambda: {'ùñï©ôð€': 'εvεrywhεrε'})
     writer(fp)
-    expected = u'{\n "ùñï©ôð€": "εvεrywhεrε"\n}'
-    if PY2:
-        expected = expected.encode('utf-8')
+    expected = '{\n "ùñï©ôð€": "εvεrywhεrε"\n}'
     assert fp.getvalue() == expected