The package can be compatible with both Python 2 and Python 3

binder/__init__.py

@@ -1,7 +1,6 @@
 import os
 import sys
 import subprocess
-from pathlib import Path
 
 try:
     from ._version import __version__ as _default_version
@@ -24,13 +23,13 @@ def _get_version():
     # Only shell out to a git subprocess if really needed, and not on a
     # shallow clone, such as those used by CI, as the latter would trigger
     # a warning from setuptools_scm.
-    root = Path(__file__).resolve().parents[1]
-    if (root / ".git").exists() and not (root / ".git/shallow").exists():
+    root = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
+    if os.path.exists(os.path.join(root, ".git")) and not os.path.exists(os.path.join(root, ".git/shallow")):
         try:
             import setuptools_scm
 
             return setuptools_scm.get_version(
-                root=str(root),
+                root=root,
                 version_scheme="post-release",
                 fallback_version=_default_version,
             )
@@ -40,4 +39,4 @@ def _get_version():
         return _default_version
 
 
-__version__: str = _get_version()
+__version__ = _get_version()

pyproject.toml

@@ -12,7 +12,17 @@ authors = [
 ]
 classifiers = [
     "Programming Language :: Python",
+    "Programming Language :: Python :: 2",
+    "Programming Language :: Python :: 2.7",
     "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.0",
+    "Programming Language :: Python :: 3.1",
+    "Programming Language :: Python :: 3.2",
+    "Programming Language :: Python :: 3.3",
+    "Programming Language :: Python :: 3.4",
+    "Programming Language :: Python :: 3.5",
+    "Programming Language :: Python :: 3.6",
+    "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
@@ -21,7 +31,7 @@ classifiers = [
     "License :: OSI Approved :: MIT License",
     "Operating System :: OS Independent",
 ]
-requires-python = ">=3.8"
+requires-python = ">=2.7"
 
 [project.urls]
 Homepage = "https://github.com/RosettaCommons/binder/"
@@ -52,7 +62,7 @@ cmake.define.LLVM_ENABLE_PROJECTS = "clang"
 
 # Wheel configuration
 wheel.packages = ["binder"]
-wheel.py-api = "py3"
+wheel.py-api = "py2.py3"
 wheel.expand-macos-universal-tags = true
 
 [tool.cibuildwheel]