Remove support for Python 3.6 (#38)

.github/workflows/build.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.6', '3.7', '3.8', '3.9', '3.10']
+        python-version: ['3.7', '3.8', '3.9', '3.10']
     steps:
       - uses: actions/checkout@v2
       - run: |

.pre-commit-config.yaml

@@ -27,7 +27,7 @@ repos:
       - id: isort
         args: ["--profile", "black"]
   - repo: https://github.com/pycqa/pydocstyle
-    rev: 6.1.1  # pick a git hash / tag to point to
+    rev: 6.1.1
     hooks:
       - id: pydocstyle
         exclude: ^(gymnasium/envs/)|(tests/)|(docs/)
@@ -40,8 +40,7 @@ repos:
     rev: v2.32.0
     hooks:
       - id: pyupgrade
-        # TODO: remove `--keep-runtime-typing` option
-        args: ["--py36-plus", "--keep-runtime-typing"]
+        args: ["--py37-plus"]
   - repo: local
     hooks:
       - id: pyright

docs/README.md

@@ -20,7 +20,7 @@ For Atari envs, add a Markdown file into `pages/environments/atari` then complet
 
 #### Non-Atari env
 
-Ensure the environment is in Gymnasium (or your fork). Ensure that the environment's Python file has a properly formatted markdown docstring. Pip install Gymnasium (or your fork) then run `docs/scripts/gen_mds.py`. This will automatically generate an md page for the environment. Then complete the [other steps](#other-steps).
+Ensure the environment is in Gymnasium (or your fork). Ensure that the environment's Python file has a properly formatted markdown docstring. Pip install Gymnasium (or your fork) then run `docs/scripts/gen_mds.py`. This will automatically generate a md page for the environment. Then complete the [other steps](#other-steps).
 
 #### Other steps
 

gymnasium/core.py

@@ -1,5 +1,4 @@
 """Core API for Environment, Wrapper, ActionWrapper, RewardWrapper and ObservationWrapper."""
-import sys
 from typing import (
     TYPE_CHECKING,
     Any,
@@ -16,17 +15,11 @@ from typing import (
 import numpy as np
 
 from gymnasium import spaces
-from gymnasium.logger import warn
 from gymnasium.utils import seeding
 
 if TYPE_CHECKING:
     from gymnasium.envs.registration import EnvSpec
 
-if sys.version_info[0:2] == (3, 6):
-    warn(
-        "Gymnasium minimally supports python 3.6 as the python foundation not longer supports the version, please update your version to 3.7+"
-    )
-
 ObsType = TypeVar("ObsType")
 ActType = TypeVar("ActType")
 RenderFrame = TypeVar("RenderFrame")

gymnasium/wrappers/compatibility.py

@@ -10,11 +10,8 @@ from gymnasium.utils.step_api_compatibility import (
 
 if sys.version_info >= (3, 8):
     from typing import Protocol, runtime_checkable
-elif sys.version_info >= (3, 7):
-    from typing_extensions import Protocol, runtime_checkable
 else:
-    Protocol = object
-    runtime_checkable = lambda x: x  # noqa: E731
+    from typing_extensions import Protocol, runtime_checkable
 
 
 @runtime_checkable

py.Dockerfile

@@ -26,6 +26,6 @@ ENV LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/root/.mujoco/mujoco210/bin"
 COPY . /usr/local/gymnasium/
 WORKDIR /usr/local/gymnasium/
 
-RUN if [ "python:${PYTHON_VERSION}" = "python:3.6.15" ] ; then pip install .[box2d,classic_control,toy_text,other] pytest=="7.0.1" --no-cache-dir; else pip install .[testing] --no-cache-dir; fi
+RUN pip install .[testing] --no-cache-dir
 
 ENTRYPOINT ["/usr/local/gymnasium/bin/docker_entrypoint"]

pyproject.toml

@@ -15,7 +15,7 @@ strict = [
 ]
 
 typeCheckingMode = "basic"
-pythonVersion = "3.6"
+pythonVersion = "3.7"
 pythonPlatform = "All"
 typeshedPath = "typeshed"
 enableTypeIgnoreComments = true

requirements.txt

@@ -10,6 +10,6 @@ matplotlib>=3.0
 box2d-py==2.3.5
 pygame==2.1.0
 ale-py~=0.8.0
-mujoco==2.2.0
+mujoco==2.2
 mujoco_py<2.2,>=2.1
 imageio>=2.14.1

setup.py

@@ -47,7 +47,7 @@ extras = {
 testing_group = set(extras.keys()) - {"accept-rom-license", "atari"}
 extras["testing"] = list(
     set(itertools.chain.from_iterable(map(lambda group: extras[group], testing_group)))
-) + ["pytest==7.0.1", "gym==0.26.2"]
+) + ["pytest==7.1.3", "gym==0.26.2"]
 
 # All dependency groups - accept rom license as requires user to run
 all_groups = set(extras.keys()) - {"accept-rom-license"}
@@ -70,7 +70,7 @@ setup(
     long_description=long_description,
     long_description_content_type="text/markdown",
     keywords=["Reinforcement Learning", "game", "RL", "AI", "gymnasium"],
-    python_requires=">=3.6",
+    python_requires=">=3.7",
     tests_require=extras["testing"],
     packages=[
         package for package in find_packages() if package.startswith("gymnasium")
@@ -90,12 +90,9 @@ setup(
         "cloudpickle >= 1.2.0",
         "importlib_metadata >= 4.8.0; python_version < '3.10'",
         "gymnasium_notices >= 0.0.1",
-        "dataclasses == 0.8; python_version == '3.6'",
     ],
     classifiers=[
-        # Python 3.6 is minimally supported (only with basic gymnasium environments and API)
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",

test_requirements.txt

@@ -6,5 +6,5 @@ matplotlib>=3.0
 imageio>=2.14.1
 pygame==2.1.0
 mujoco_py<2.2,>=2.1
-pytest==7.0.1
+pytest==7.1.3
 gym==0.26.2

tests/envs/test_compatibility.py

@@ -1,4 +1,3 @@
-import sys
 from typing import Any, Dict, Optional, Tuple
 
 import numpy as np
@@ -81,8 +80,6 @@ def test_explicit():
 
 def test_implicit():
     old_env = LegacyEnvImplicit()
-    if sys.version_info >= (3, 7):
-        # We need to give up on typing in Python 3.6
     assert isinstance(old_env, LegacyEnv)
     env = EnvCompatibility(old_env, render_mode="rgb_array")
     assert env.observation_space == Discrete(1)