Small version fixes (#670)

* Pin old setuptools version so we can install old gym version and invalidate windows cache.

* Update isort version.

* Update setuptools version in pyproject.toml

.circleci/config.yml

@@ -122,7 +122,7 @@ commands:
       # Download and cache dependencies
       - restore_cache:
           keys:
-            - v7win-dependencies-{{ checksum "setup.py" }}-{{ checksum "ci/build_and_activate_venv.ps1" }}
+            - v8win-dependencies-{{ checksum "setup.py" }}-{{ checksum "ci/build_and_activate_venv.ps1" }}
 
       - run:
           name: install python and binary dependencies
@@ -152,7 +152,7 @@ commands:
       - save_cache:
           paths:
             - .\venv
-          key: v7win-dependencies-{{ checksum "setup.py" }}-{{ checksum "ci/build_and_activate_venv.ps1" }}
+          key: v8win-dependencies-{{ checksum "setup.py" }}-{{ checksum "ci/build_and_activate_venv.ps1" }}
 
       - run:
           name: install imitation

.pre-commit-config.yaml

@@ -17,7 +17,7 @@ repos:
   - id: black
   - id: black-jupyter
 - repo: https://github.com/PyCQA/isort
-  rev: 5.10.1
+  rev: 5.12.0
   hooks:
   - id: isort
 # Python static analysis

ci/build_and_activate_venv.ps1

@@ -9,5 +9,6 @@ If ($venv -eq $null) {
 
 virtualenv -p python3.8 $venv
 & $venv\Scripts\activate
-python -m pip install --upgrade pip
+# Note: We need to install setuptools==66.1.1 to allow installing gym==0.21.0.
+python -m pip install --upgrade pip setuptools==66.1.1
 pip install ".[docs,parallel,test]"

ci/build_and_activate_venv.sh

@@ -20,5 +20,6 @@ fi
 virtualenv -p ${python_version} ${venv}
 # shellcheck disable=SC1090,SC1091
 source ${venv}/bin/activate
-python -m pip install --upgrade pip setuptools>=45
+# Note: We need to install setuptools==66.1.1 to allow installing gym==0.21.0.
+python -m pip install --upgrade pip setuptools==66.1.1
 pip install ".[docs,parallel,test]"

pyproject.toml

@@ -1,5 +1,6 @@
 [build-system]
-requires = ["setuptools>=45", "setuptools_scm[toml]>=6.2"]
+# Note: setuptools 66.1.1 is the last version that supports installing gym==0.21.0
+requires = ["setuptools==66.1.1", "setuptools_scm[toml]>=6.2"]
 build-backend = "setuptools.build_meta"
 
 # TODO(juan): we've commented this out because currently