Remove Python 3.6 support (#252)

docs/src/advanced_usage.rst

@@ -189,17 +189,11 @@ Synchronous credentials clients are recommended.
 
 .. note::
 
-    :ref:`client` context managers are async safe on Python 3.7+, meaning that
+    :ref:`client` context managers are async safe, meaning that
     they can be used in many tasks without affecting the state of other tasks.
     *However*, setting values outside of all contexts modifies the persistent
     value directly, and as such may affect other tasks.
 
-.. warning::
-
-    :ref:`client` context managers are **not** async safe on Python 3.6
-    due to missing async implementation in the PyPI backport of
-    the ``contextvars`` package from the standard library of Python 3.7.
-
 Localisation
 ------------
 Many API calls that retrieve track information accept a ``market`` or

docs/src/release_notes.rst

@@ -7,6 +7,7 @@ Unreleased
 ----------
 Changed
 *******
+- Removed Python 3.6 support and its conditional dependencies (:issue:`252`)
 - Dependency to HTTPX upgraded to include versions
   from ``0.15`` to ``0.19.*`` (:issue:`250`, :issue:`261`)
 - Add fields to :class:`Request` and change their meaning to be in line with

setup.py

@@ -1,6 +1,6 @@
 import sys
 
-python_requires = (3, 6)
+python_requires = (3, 7)
 python_requires_str = '.'.join([str(i) for i in python_requires])
 
 error = """
@@ -88,8 +88,6 @@
     python_requires='>=' + python_requires_str,
     install_requires=[
         'httpx>=0.15,<0.20',
-        'dataclasses;python_version<"3.7"',
-        'contextvars;python_version<"3.7"',
     ],
     extras_require=extras_require,
 
@@ -98,7 +96,6 @@
         'Intended Audience :: Developers',
         'License :: OSI Approved :: MIT License',
         'Programming Language :: Python',
-        'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',