Disable export to xml on py3.7 or less

Author: pgleeson

docs/sphinx/source/api/examples/document.py

@@ -2,6 +2,7 @@
 from modelspec import field, instance_of, optional
 from modelspec.base_types import Base
 from typing import List
+import sys
 
 # Example showing how to create a model of a document and use it to create/serialize instances
 
@@ -69,13 +70,16 @@ class Document(Base):
 
 doc.to_json_file("document.json")
 doc.to_yaml_file("document.yaml")
+print(" >> Full document details in YAML format:\n")
+print(doc.to_yaml())
+
 doc.to_bson_file("document.bson")
-doc.to_xml_file("document.xml")
 
-print(" >> Full document details in YAML format:\n")
+if sys.version_info >= (3, 8):
+    doc.to_xml_file("document.xml")
+    print(" >> Full document details in XML format:\n")
+    print(doc.to_xml())
 
-print(doc.to_yaml())
-print(doc.to_xml())
 
 doc_md = doc.generate_documentation(format="markdown")
 

examples/document.py

@@ -2,6 +2,7 @@
 from modelspec import field, instance_of, optional
 from modelspec.base_types import Base
 from typing import List
+import sys
 
 # Example showing how to create a model of a document and use it to create/serialize instances
 
@@ -69,13 +70,16 @@ class Document(Base):
 
 doc.to_json_file("document.json")
 doc.to_yaml_file("document.yaml")
+print(" >> Full document details in YAML format:\n")
+print(doc.to_yaml())
+
 doc.to_bson_file("document.bson")
-doc.to_xml_file("document.xml")
 
-print(" >> Full document details in YAML format:\n")
+if sys.version_info >= (3, 8):
+    doc.to_xml_file("document.xml")
+    print(" >> Full document details in XML format:\n")
+    print(doc.to_xml())
 
-print(doc.to_yaml())
-print(doc.to_xml())
 
 doc_md = doc.generate_documentation(format="markdown")
 

examples/neuroml2/neuroml2_spec.py

@@ -2,6 +2,7 @@
 from modelspec import field, instance_of, optional
 from modelspec.base_types import Base
 from typing import List
+import sys
 
 # Example showing ...
 
@@ -147,13 +148,15 @@ class neuroML(Base):
 
     nml_doc.to_json_file("%s.json" % nml_doc.id)
     nml_doc.to_yaml_file("%s.yaml" % nml_doc.id)
-    nml_doc.to_bson_file("%s.bson" % nml_doc.id)
-    nml_doc.to_xml_file("%s.xml" % nml_doc.id)
-
     print(" >> Full document details in YAML format:\n")
-
     print(nml_doc.to_yaml())
-    print(nml_doc.to_xml())
+
+    nml_doc.to_bson_file("%s.bson" % nml_doc.id)
+
+    if sys.version_info >= (3, 8):
+        nml_doc.to_xml_file("%s.xml" % nml_doc.id)
+        print(" >> Full document details in XML format:\n")
+        print(nml_doc.to_xml())
 
     print("Generating documentation...")
 

src/modelspec/base_types.py

@@ -119,6 +119,10 @@ def to_xml(self) -> str:
         """
         Convert the data dictionary to an XML string representation using the ElementTree library.
         """
+        if sys.version_info < (3, 8):
+            raise Exception(
+                "XML export functionality is not available in Python 3.7 or lower"
+            )
         from modelspec.utils import build_xml_element
 
         # root = ET.Element("modelspec")