Python 3.12 compatability

Changelog.rst

@@ -1,3 +1,13 @@
+Version NEXTRELEASE
+-------------------
+
+**2024-??-??**
+
+* Upgrades to allow cfdm to work with Python 3.12
+  (https://github.com/NCAS-CMS/cfdm/issues/302)
+
+----
+
 Version 1.11.1.0
 ----------------
 

cfdm/data/data.py

@@ -395,7 +395,7 @@ def __int__(self):
                 f"Python scalars. Got {self}"
             )
 
-        return int(self.array)
+        return int(self.array[(0,) * self.ndim])
 
     def __iter__(self):
         """Called when an iterator is required.

cfdm/read_write/netcdf/netcdfread.py

@@ -1025,7 +1025,7 @@ def read(
 
         # If the string contains any commas, it is assumed to be a
         # comma-separated list.
-        all_conventions = re.split(",\s*", Conventions)
+        all_conventions = re.split(r",\s*", Conventions)
         if all_conventions[0] == Conventions:
             all_conventions = Conventions.split()
 

cfdm/read_write/netcdf/netcdfwrite.py

@@ -3949,7 +3949,7 @@ def _write_field_or_domain(
         # Ancillary variables
         if field and ancillary_variables:
             ancillary_variables = " ".join(ancillary_variables)
-            ancillary_variables = re.sub("\s+", " ", ancillary_variables)
+            ancillary_variables = re.sub(r"\s+", " ", ancillary_variables)
             logger.info(
                 "    Writing ancillary_variables attribute to "
                 f"netCDF variable {ncvar}: {ancillary_variables!r}"

cfdm/test/test_Data.py

@@ -784,6 +784,15 @@ def test_Data_masked_values(self):
         self.assertTrue(np.isclose(da, a).all())
         self.assertTrue((da.mask == a.mask).all())
 
+    def test_Data__int__(self):
+        """Test Data.__int__."""
+        for x in (1.1, [1.1], [[1.1]]):
+            self.assertEqual(int(cfdm.Data(x)), 1)
+
+        # Can't int on data with size > 1
+        with self.assertRaises(TypeError):
+            int(cfdm.Data([1, 2]))
+
 
 if __name__ == "__main__":
     print("Run date:", datetime.datetime.now())

scripts/cfdump

@@ -11,18 +11,18 @@ if __name__ == "__main__":
     def print_help(version, date):
         import subprocess
 
-        manpage = """\
+        manpage = """
 .TH "CFDUMP" "1" "{0}" "{1}" "cfdump"
 .
 .SH NAME
 .
-cfdump \- view the contents of a CF-netCDF dataset according to the CF data model.
+cfdump - view the contents of a CF-netCDF dataset according to the CF data model.
 .
 .
 .
 .SH SYNOPSIS
 .
-cfdump [\-s] [\-c] [\-e file [\-e file] ...] [\-h] file
+cfdump [-s] [-c] [-e file [-e file] ...] [-h] file
 .
 .
 .
@@ -49,32 +49,32 @@ For versions of the CF conventions up to and including CF-{3}.
 .SH OPTIONS
 .
 .TP
-.B \-c, \-\-complete
+.B -c, --complete
 Display complete descriptions. All properties of all constructs,
 including metadata constructs and their components are described
 without abbreviation with the exception of data arrays which are
 generally abbreviated to their first and last values.
 .
 .
 .TP
-.B \-e file, \-\-external=file
+.B -e file, --external=file
 Read external variables from the given external file. Multiple
 external files may be provided by specifying more than one
 .ft B
-\-e
+-e
 .ft P
 option.
 .
 .
 .TP
-.B \-h, \-\-help
+.B -h, --help
 Display this man page.
 .
 .
 .TP
-.B \-s, \-\-short
+.B -s, --short
 Display short descriptions. Each field construct is described by a
-short, one\-line summary that gives the identity of the field
+short, one-line summary that gives the identity of the field
 construct; the identities and sizes of the dimensions spanned by the
 data array; and the units of the data.
 .
@@ -105,7 +105,7 @@ David Hassell
             [
                 "man",
                 "-r",
-                " Manual page cfdump(1)\ ?ltline\ %lt?L/%L.:",
+                " Manual page cfdump(1) ?ltline %lt?L/%L.:",
                 "-l",
                 "-",
             ],