fix: from attr import attr, attrs, attrib, Factory ImportError: cannot import name 'attrs' from 'attr' (#127)

* Add tox env verifying plain install (without dev requirements).

* Install attrs instead of attr package.

Author: chenkins

pyproject.toml

@@ -19,7 +19,7 @@ classifiers = [
     'Programming Language :: Python :: 3.12',
 ]
 dependencies = [
-    "attr",
+    "attrs",
     "boto3",
     "click",
     "crowdai_api",
@@ -42,6 +42,8 @@ dependencies = [
     "recordtype",
     "redis",
     "seaborn",
+    # https://docs.python.org/3/whatsnew/3.12.html: Python 3.12 has removed pkg_resources from the standard library (moved to setuptools):
+    "setuptools",
     "svgutils",
     "timeout_decorator",
 

requirements-dev.txt

@@ -24,11 +24,10 @@ async-lru==2.0.4
     # via jupyterlab
 async-timeout==5.0.1
     # via redis
-attr==0.3.2
-    # via flatland-rl (pyproject.toml)
 attrs==25.1.0
     # via
     #   flake8-eradicate
+    #   flatland-rl (pyproject.toml)
     #   jsonschema
     #   referencing
 babel==2.17.0

requirements-ml.txt

@@ -24,11 +24,10 @@ async-timeout==5.0.1
     # via
     #   aiohttp
     #   redis
-attr==0.3.2
-    # via flatland-rl (pyproject.toml)
 attrs==25.1.0
     # via
     #   aiohttp
+    #   flatland-rl (pyproject.toml)
     #   jsonschema
     #   referencing
 boto3==1.36.20

requirements.txt

@@ -8,7 +8,7 @@ asttokens==3.0.0
     # via stack-data
 async-timeout==5.0.1
     # via redis
-attr==0.3.2
+attrs==25.1.0
     # via flatland-rl (pyproject.toml)
 boto3==1.36.20
     # via flatland-rl (pyproject.toml)

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-env_list = py{310,311,312},notebooks,py{310,311,312}-ml
+env_list = py{310,311,312},notebooks,py{310,311,312}-ml,py{310,311,312}-verify-install
 
 [gh-actions]
 python =
@@ -123,3 +123,10 @@ deps =
     -r requirements-dev.txt
 commands =
     python -m build
+
+[testenv:py{310,311,312}-verify-install]
+# install flatland-rl without additional dependencies
+skip_install = false
+commands =
+    python --version
+    python -c 'from flatland.evaluators.service import FlatlandRemoteEvaluationService'