version checking

Co-authored-by: Sadie L. Bartholomew <[email protected]>

Author: davidhassell

cf/__init__.py

@@ -124,7 +124,10 @@
     _minimum_vn = "1.12.0.0"
     _maximum_vn = "1.12.1.0"
     _cfdm_version = Version(cfdm.__version__)
-    if not Version(_minimum_vn) <= _cfdm_version < Version(_maximum_vn):
+    if (
+        _cfdm_version < Version(_minimum_vn) or
+        _cfdm_version >= Version(_maximum_vn)
+    ):
         raise RuntimeError(
             "Bad cfdm version: cf requires "
             f"{_minimum_vn}<=cfdm<{_maximum_vn}. "