Fallback for Py<3.11

Author: michalsta

.github/scripts/check_version.py

@@ -1,6 +1,5 @@
 import subprocess
 import sys
-import tomllib
 
 def git_version():
     version = subprocess.check_output(
@@ -10,10 +9,20 @@ def git_version():
     return version
 
 def pyproject_version():
-    with open("pyproject.toml", "rb") as f:
-        pyproject_data = tomllib.load(f)
-    version = pyproject_data["project"]["version"]
-    return version
+    try:
+        import tomllib
+        with open("pyproject.toml", "rb") as f:
+            pyproject_data = tomllib.load(f)
+        version = pyproject_data["project"]["version"]
+        return version
+    except ImportError:
+        # primitive parsing for Python < 3.11
+        with open("pyproject.toml", "r", encoding="utf-8") as f:
+            for line in f:
+                if line.strip().startswith("version ="):
+                    version = line.split("=", 1)[1].strip().strip('"').strip("'")
+                    return version
+    raise RuntimeError("Could not determine version from pyproject.toml")
 
 if __name__ == "__main__":
     assert git_version() == "v"+pyproject_version(), \