Drop support for legacy Python 2

setup.py

@@ -1,21 +1,50 @@
 #!/usr/bin/env python
-from setuptools import find_packages, setup
+from __future__ import print_function
+import sys
 
-with open("README.md") as f:
-    long_description = f.read()
+from setuptools import find_packages, setup
 
 version_dict = {}
 with open("pylast/version.py") as f:
     exec(f.read(), version_dict)
     version = version_dict["__version__"]
 
+
+if sys.version_info < (3, 4):
+    error = """pylast 3.0 and above are no longer compatible with Python 2.
+
+This is pylast {} and you are using Python {}.
+Make sure you have pip >= 9.0 and setuptools >= 24.2 and retry:
+
+ $ pip install --upgrade pip setuptools
+
+Other choices:
+
+- Upgrade to Python 3.
+
+- Install an older version of pylast:
+
+$ pip install 'pylast<3.0'
+
+For more information:
+
+https://github.com/pylast/pylast/issues/265
+""".format(
+        version, ".".join([str(v) for v in sys.version_info[:3]])
+    )
+    print(error, file=sys.stderr)
+    sys.exit(1)
+
+with open("README.md") as f:
+    long_description = f.read()
+
+
 setup(
     name="pylast",
     long_description=long_description,
     long_description_content_type="text/markdown",
     version=version,
     author="Amr Hassan <amr.hassan@gmail.com> and Contributors",
-    install_requires=["six"],
     tests_require=[
         "coverage",
         "flaky",
@@ -34,17 +63,16 @@ setup(
         "Topic :: Internet",
         "Topic :: Multimedia :: Sound/Audio",
         "Topic :: Software Development :: Libraries :: Python Modules",
-        "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3 :: Only",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
     ],
-    python_requires=">=2.7.10, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*",
+    python_requires=">=3.4",
     keywords=["Last.fm", "music", "scrobble", "scrobbling"],
     packages=find_packages(exclude=("tests*",)),
     license="Apache2",